Abstract
Collectives adapt their network structure to the challenges they face. It has been hypothesized that collectives experiencing a real or imagined threat from an outgroup tend to consolidate behind a few group members, and that network structures in which a few members attract most of the attention are more likely in politically extreme groups. These hypotheses have not been tested in large-scale real-world settings. We reconstruct networks of tens of thousands of commenters participating in comment sections of high-profile U.S. political news websites spanning the political spectrum from left to right, including Mother Jones, The Atlantic, The Hill, and Breitbart. We investigate the relationship between different indices of inequality of attention in commenters’ networks and perceived group threat associated with significant societal events, from elections and political rallies to mass shootings. Our findings support the hypotheses that groups facing a real or imagined outgroup threat and groups that are more politically extreme are more likely to attend to a few high-profile members. These results provide an extensive real-world test of theoretical accounts of collective adaptation to outgroup threats.
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Introduction
New technologies facilitate formation and dissolution of network connections, allowing collectives to quickly consolidate behind ideas and leaders they find useful for solving their perceived and real problems1. While this collective dynamics is not new, online communication platforms make it particularly easy for some individuals to attract collective attention. While not sufficient, the attention is a necessary precondition for any later influence one might have on the discourse, beliefs, and behaviors of others in the collective. More prominent members have the power to steer the conversation2 and influence others through both normative conformity, by popularizing specific worldviews and behaviors, and informational conformity, by being trusted as sources of reliable information3. Given the frequent disconnect between the quality of arguments and their popularity in online media4, such dynamics can have consequences that are ultimately harmful to collectives and their members5.
Here we investigate collective dynamics in comment sections of news sites, where millions of people comment daily on current societal events6. Reading others’ comments can shape one’s own opinions about an event and the source of the story7, and help spread opinions and claims which counter the mainstream narrative8. Commenters can influence how other readers perceive the issue being discussed in the article, their evaluations of the article’s quality, and their affective response to the issue9,10. While participants in public discourse should ideally have similar opportunities to be heard11,12, in online discussions some commenters attract more attention than others and are more likely to influence the subsequent discussion.
We reconstruct networks of commenters discussing major societal events, from elections to political rallies and mass shootings, on four prominent news websites spanning the U.S. political spectrum from left to right: Mother Jones, The Atlantic, The Hill, and Breitbart. We study conditions under which these commenter networks consolidate around a smaller set of high-profile voices, as reflected in the unequal distribution of replies commenters get from others13.
Two socio-psychological factors, in particular, have been proposed to promote unequal attention to group members: imagined or real outgroup threat, and political extremity of the group. We measure how different individual- and network-based indices of inequality of attention change around societal events perceived as more or less threatening and how they differ for more or less politically extreme commenter collectives.
Group threat and inequality of attention
Real or imagined group threat from an opposing other group (outgroup) to one’s own group (ingroup) can prompt a series of changes in collective dynamics that might help a group to consolidate and coordinate for better defense or attack. Specifically, a threat from another group can lead to a decrease in diversity of opinions within a group and a higher likelihood of following opinions of a few influential group members14. This is particularly likely for groups under threat that are also highly cohesive15,16, with members that share similar characteristics and views17, and are motivated to protect the collective positive image18. This reaction can be adaptive because groups that are more cohesive and coordinated can have an advantage in inter-group conflicts19,20, but it can also lower groups’ ability to solve problems that require diversity of opinions21.
We, therefore, hypothesize that inequality of commenters’ attention will become larger after events that bring a real or imagined threat to one’s ingroup from a specific outgroup. For example, just before the 2016 U.S. Presidential Election, Clinton was favored as the election winner, and this might have been perceived as a threat among the Trump-supporting voters. After the 2016 Election and Trump’s unexpected victory, the Clinton-supporters might have felt threatened. Consequently, we predict higher inequality of attention among commenters on right-wing sites (such as Breitbart) before the 2016 U.S. Election, and among commenters on the left-oriented ones (such as Mother Jones and The Atlantic) after the Election. A similar change could be expected after the 2017 Trump Presidential Inauguration, which consolidated his victory, and after the alt-right 2017 Charlottesville Rally. The same type of change, but in the opposite direction, could have happened after the 2018 U.S. Election for Congress, where Democrats achieved significant victories.
Political extremity and inequality of attention
Another factor that could be related to inequality of attention to other group members is political extremity of a collective. Both radical right- and radical left-leaning political extremists have been linked to heightened deference to authorities compared to more moderate political ideologies22,23. The propensity towards authoritarianism has traditionally been linked to right-wing ideology and operationalized in terms of ideological commitment to tradition, authority, and social convention against threats of change, protest, and political rebellion24,25,26. However, members of left-oriented groups, especially those who label themselves as communist, can also show authoritarian traits27. While overtly the extreme right- and left-oriented groups differ in significant ways, such as in their attitudes towards the existing social order vs. liberation of oppressed groups, they also show important similarities, including estrangement from the government, intolerance of ambiguity, intolerance towards political opponents, attraction to totalitarian measures and tactics, intolerance of human frailty, and paranoid tendencies—including a belief in conspiracy and feelings of persecution28,29. Consequently, we hypothesize that networks of commenters on news sites advocating more radical political beliefs (both left-oriented ones, such as Mother Jones and The Atlantic, and the right-oriented ones, such as Breitbart30,31,32,33), which likely include commenters with similar levels and directions of political extremity, will be characterized by a larger inequality of attention than the commenter networks on the more centrist news sites (such as The Hill).
Inequality of attention in real-world discussions
To investigate how well these theoretical predictions describe the actual public discourse, we collected two different data sets. The first one consists of all comments posted on Mother Jones, The Atlantic, The Hill, and Breitbart news websites a month before and a month after seven important societal and political events, and the information about who replies to whom (see “Method” for details). We include all political events ranked among the top five U.S. news according to Google Trends from 2016 to 2018 (Table S234). In addition, we include the 2017 Presidential Inauguration and the 2017 Charlottesville Rally, which were not listed among the top five news but were highly covered due to their wide-reaching political and social effects35,36. Of the seven events, four involved a clear conflict between different political groups and could have been perceived as a real or imagined threat from a specific other group: the 2016 U.S. Election, the 2017 Presidential Inauguration, the 2017 Charlottesville alt-right Rally, and the 2018 U.S. Election. The other three events were also societally very important but the group that caused the threat was less specific, at least for the commenters on the U.S. left- and right-oriented news websites: the 2016 Orlando Attack, the 2016 Brexit Referendum, and the 2017 Las Vegas Shooting.
We recreate the network of commenters before and after each event, where links are direct replies from one commenter to another, across different discussions, weighted by the overall number of replies in a particular time period. For each news website, for the month before and after each societal event, we derived the network of commenters and calculated four measures of attention inequality in these networks. Two of the measures describe inequality of attention of individual commenters, namely, (1) skewness of commenters’ weighted in-degree distribution and (2) skewness of the distribution of their Page Rank centralities. Presumably, people who reply to a commenter have attended to their comment, which then can have some influence on their own thinking, even if they disagree with the comment. The more unequal this distribution of in-degrees, the more unequal the attention to and the potential influence of different commenters. Similarly, a commenter that is replied to by commenters who themselves have a lot of replies (i.e., who has a higher Page Rank) could be considered to have a higher potential influence. The other two measures describe the aspects of the overall structure of commenter networks that are related to inequality of attention, namely, (3) the proportion of independent commenters who neither reply to others nor are replied to, and (4) the proportion of connected components of the network. The proportion of independent commenters can be expected to decrease under real or imagined threat as commenters consolidate behind a few prominent users, rather than posting alone. Similarly, if people preferentially reply to a smaller subset of commenters there should be relatively fewer connected components in the network than if there is no particular preference for replying to some commenters.
Our second data set includes human judgments about the perceived threat posed by different events, which we collected in a survey of participants with different political views (see “Method” for details). This data allowed us to estimate how much the chosen events were perceived as threatening to one’s own ingroup, depending on the ingroup’s political orientation.
We use these data sets to investigate our two main questions: (1) How does inequality of attention change when a group is experiencing a threat from an outgroup?, and (2) How does the inequality of attention differ for more or less politically extreme news sites?
Method
Data on commenter networks around important societal events
We collected all comments posted a month before and a month after seven important societal events, through Disqus API (the data collection took place in 2019). The month-long interval before and after each event provided us with sufficient data from all sites, while not complicating the analysis with other significant events occurring in a temporal vicinity. Table S1 presents the number of unique commenters, comments, and articles included in the analysis. Figure S2 in Supplementary Material shows the number of comments per article for different websites and events.
Events
Four of the seven events involve a clearly defined ingroup and outgroup for most people in the U.S. and are therefore expected to evoke more perceived outgroup threat. As described in the Introduction, such events are the 2016 U.S. Presidential Election, the 2017 Trump Presidential Inauguration, the alt-right 2017 Charlottesville Rally, and the 2018 U.S. Election for Congress. Two of them, the 2016 Orlando Attack and 2017 Las Vegas Shooting, were perpetrated by single individuals without clear motivation. The third was a shock happening to another society: the 2016 Brexit, where most Americans did not clearly belong to either of the two main groups involved. After events such as those three, the whole society might feel threatened but not be able to pinpoint the threat to a clearly defined outgroup. Instead, this generalized feeling of threat might prompt more information-seeking and questioning of existing views, division into smaller groups to explore a broader range of possible solutions, and seeking information outside the group37,38,39,40; though see41,42. Therefore, such unspecific threats may lead to a lower rise in inequality within a group than the more specific outgroup threats.
News websites
We collected comments from discussion sections of four U.S. news websites, including two on the left side of the political spectrum—Mother Jones and The Atlantic, one centrist or moderate right—The Hill, and one on the extreme right—Breitbart. We derived the political ideology of these news websites according to several different media rating systems at the time of the data collection30,31,32,33. Mother Jones43 is a magazine launched in 1976 that includes news, commentary, and investigative reporting on topics ranging from politics and the environment to health and culture. According to the rating systems, Mother Jones typically espouses liberal or progressive views. The Atlantic44 is a magazine founded in 1857, providing daily coverage and analysis of news and issues related to politics, education, technology, health, science, and culture. Its political inclination is typically rated as left or left-center. The Hill45 is a news website established in 1994, focusing on politics, policy, business, and international relations. During the time period that we focus on here, it has been generally rated as the right of center30,32. Breitbart46, founded in 2007, is a news, opinion, and commentary website. It is generally considered to have an extreme right bias and to be an unreliable news source (e.g.47, though see48) as it sometimes publishes articles in support of conspiracy theories and false claims.
For the purpose of this analysis, we assume that most commenters on a particular news website have political leanings aligned with those advocated by the website. While this is certainly not the case for all commenters, our extensive reading of the comments posted on each of these websites suggests that this holds in a vast majority of cases. In addition, we have analyzed the frequency with which commenters who posted mostly on one site also commented on the other news sites. As shown in Tables S4 and S5, the percentage of such commenters and their comments is quite small.
During most of the period studied in this paper (2016–2018), all four news websites used the Disqus platform to allow readers to comment on their articles49. The Atlantic removed commenting sections in early 2018, and Mother Jones switched to another commenting platform by mid-2019, ending the possibility of comparing Disqus comments on left vs. right news sites. The Hill and Breitbart used Disqus as their commenting platform throughout the studied period.
The comments from the news websites were obtained within the terms of use of the Disqus API (see50, in particular, the section “Rights Regarding User Content”), and Disqus displayed its privacy policy prominently at the top of the commenting section of each site51. This research activity is exempt from requiring IRB approval because the comments are publicly available and used in a completely anonymized form (see paragraph 46.104-d-4 at52).
Establishing commenter networks
For each comment, we have information about the unique identification number (id) of the commenter who posted it and whether the comment was a reply to another comment (i.e., whether the comment was a ‘child’ of a ‘parent’ comment) or posted to the general discussion (and then either attracted others’ replies, becoming a ‘parent’, or not getting any replies, thus remaining ‘independent’). To post comments, readers have to register for Disqus but can otherwise remain anonymous. Disqus does not require linking one’s account to a social media account or another form of identification, and indeed we observe that most Disqus users commenting on the websites we study do not use their real names. Nevertheless, because commenters need to register, each comment can be uniquely attributed to a specific individual.
Using this information, we can build a commenter network. Within a specific period of time, commenters can be represented as a part of a directed network in which edges are direct replies from one commenter to the other, accumulated over that period across different articles and comment threads. The weight of a directed link is equal to the number of replies from one commenter to the other. Independent commenters, who neither reply to anyone nor are replied to by others, are represented as disconnected nodes in this network.
Besides posting comments, two other ways of interacting with comment sections are possible. Registered readers can simply upvote or downvote a comment. Unlike comments, these votes cannot be traced back to specific individuals and are therefore not useful for the purpose of building a network of commenters. In addition, some news websites allow readers to react to certain articles through the websites’ social media accounts. These comments—typically 10–15% of all comments—appear in comment sections as ‘guest’ comments. The individual authors of these comments cannot be traced, and therefore they are not included in our analyses.
Some commenters get more replies than others (Fig. S3) , for at least two intertwined reasons. First, certain commenters are very popular to begin with and other readers might be particularly alert and willing to reply to their comments. Second, some commenters’ comments can be more visible due to the way comments are displayed. Of note, on social media sites such as Facebook and Twitter, numerous algorithms control the display, making it more likely that users see other users, messages, and promotions that are in line with their personal preferences. In contrast, in the comment sections of the news sites that we investigate, there is no such customization. Users can change the display in only two ways: they can sort the comments in different ways, and they can choose how many comments at the time to display. A default sorting in Disqus is a function of the number of up- and downvotes received as the parent comment in a thread, or as an independent comment (‘best’ sorting53). Users can instead choose to sort the comments from the ‘newest’ to the ‘oldest’, or vice versa. They can see the first 50 comments according to the current sorting and typically have to press the ‘Load more comments’ button at the bottom of the page if they wish to see further comments. Obviously, the ‘best’ sorting will lead to a ‘rich get richer’ dynamics, whereby initially more upvoted comments will be more visible, potentially attracting additional votes and replies. These two factors are interrelated: more popular commenters are likely to get more upvotes early on, which promotes their visibility and further promotes their popularity.
In addition, site moderators can affect somewhat what the users can see. They can set up more or less strict moderation settings and change them over time54. For example, they can automatically delete comments containing certain words or allow commenting only by registered users. They can also allow users to upvote and/or downvote comments. These uncontrollable differences are likely to introduce noise in our analyses but are unlikely to cause systematic biases. Overall, the fact that all four news sites we investigate use the same commenting platform enables an easier comparison of commenting patterns across sites because the commenting interface was the same on all of them.
We can use the commenter network to investigate different aspects of inequality of attention among commenters. Here we focus on network-based indices, including those measuring the skewness of the distribution at the level of individual commenters (the first two measures below), and the inequality at the level of the overall network structure (the second two measures below):
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1.
Skewness of the weighted in-degree distributions. For each commenter, we calculate their weighted in-degree by summing up all the replies they received in a given period from other commenters. We normalize in-degrees within each period to the range [0 1], where 0 corresponds to the lowest value in the data set and 1 to the highest one. To get an inequality of the in-degree distribution55, we calculate the skewness index, corrected for network size (equations 1 and 5 in56, implemented in Matlab package ‘skewness’). Note that skewness is more appropriate than the Gini index57 when the most important changes are at the right-hand tail of the distribution, as is the case here. As we are particularly interested in between-group differences and temporal changes at the tail ends of these distributions, we calculate skewness for the top 1% of commenters ordered by centrality, as well as for all commenters together. We expect clearer results for the top 1% because distributions of centralities have very long tails (see Figs. S3 and S4 in Supplementary Material) that can dampen measures of change in the inequality occurring at the very top part of the distributions.
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2.
Skewness of Page Rank distributions. For each commenter, we calculate their Page Rank index, normalize all indices within each period to [0 1] range as above, and assess the inequality of Page Rank58 distributions in the same way as described above for in-degree distributions.
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3.
Proportion of the independent commenters among all commenters. Independent commenters are those that neither reply to another commenter (they always post their comments directly to the general discussion) nor are replied to by other commenters.
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4.
Proportion of connected components in the commenter network. We calculated the number of connected components and divided it by the maximum number of components, that is, the total number of commenters.
Another way of measuring attention could be the average size of a reply tree that a commenter managed to initiate in a particular time period. However, to the readers it is often not clear who initiated a specific discussion, because of the limited number of comments (50) that can be shown on a single screen, and because of the condensed way in which various branches of the reply tree are shown. Most discussions occur between commenters within a particular part of the tree, rather than between the top commenter and the other commenters. Therefore, in our analysis, we focus only on the direct links between commenters, rather than counting all indirect links.
Data on perceived threats associated with important societal events
In addition to the network data, we collected evaluations of different aspects of perceived threat evoked by each of the seven societal events described above, in a survey on a sample of 100 participants from Amazon Mechanical Turk59. The median age of participants was 38 (24–78), with 55 of them identifying as men and 45 as women, and 73 having college degrees. We used the service CloudResearch60 to select participants who previously identified themselves as having liberal or conservative political views. We asked them about their political orientation and found that 55 reported liberal political views, 40 conservative, and 5 moderate views. These sample sizes were determined as sufficient to reliably detect the expected large differences between liberal- and conservative-leaning participants in the evaluation of threats from different political events61,62,63. All participants provided an informed consent and the study was approved by the IRB of the University of New Mexico (1331148). All methods were performed in accordance with the relevant guidelines and regulations.
Participants answered seven questions about each event. Two questions asked about the threat they experienced personally: “How threatened did you personally feel in the month after this event?” (1—Not at all threatened ...7—Extremely threatened); and “In the month after the event, did you feel more or less threatened compared to the month before the event?”(1—I felt much less threatened ...7—I felt much more threatened). One question asked about the overall perceived threat for most people: “Thinking now of all people in the U.S., independently of their political orientation: In the month after the event, did most people feel more or less threatened compared to the month before the event?” (1—Most people felt much less threatened ...7—Most people felt much more threatened).
Most importantly for the purpose of this study, four questions measured perceived threat to one’s own ingroup and outgroup: “In your view, did the event clearly benefit Democrats at the expense of Republicans, Republicans at the expense of Democrats, or were both groups affected similarly?”(The event benefited Democrats at the expense of Republicans; The event benefited Republicans at the expense of Democrats; The event benefited both Democrats and Republicans; The event hurt both Democrats and Republicans); “Who do you think felt more threatened in the month after this event, Democrats or Republicans?”(1—Democrats felt much more threatened ...7—Republicans felt much more threatened); “Thinking now of Democrats, do you think they felt more or less threatened in the month after the event compared to the month before this event?” (1—Democrats felt much less threatened ...7—Democrats felt much more threatened); and “Thinking now of Republicans, do you think they felt more or less threatened in the month after the event compared to the month before this event?”(1—Republicans felt much less threatened ...7—Republicans felt much more threatened).
As expected, for most specific threats, there is a larger difference between threat experienced by our liberal and conservative participants, compared to non-specific threats (panel 1 of Fig. S1 in Supplementary Material). Similarly, for change in threat from before to after the event, the differences between our liberal and conservative participants are typically larger for specific threats than for non-specific threats (panel 2). For all specific threats, all participants (both liberal and conservative) say one party benefits at the expense of the other more often, whereas for all non-specific threats they more often say that both parties benefit or both parties hurt (panel 3). More participants say that one party feels more threatened by specific threats, compared to non-specific threats where more participants say that both parties feel threatened (panel 4). Participants evaluated that Democrats felt more threatened after compared to before the 2016 U.S. Election, the 2017 Inauguration, and the 2017 Charlottesville Rally; and less threatened after compared to before the 2018 U.S. Election (panel 5). Their evaluations are in the opposite direction for Republicans, as expected (panel 6). For non-specific threats, differences are smaller and the same for both parties (panels 5 and 6). There is a stronger perceived decrease in threat after Brexit for Republicans than for Democrats, but for both groups, the change is in the same direction, as expected. Finally, on average there is more difference between our liberal and conservative participants in perceived threat to all people in the U.S. for specific than for non-specific group threats.
To control for the influence of distortions in memory since the event, for each event, participants also reported how well they remembered it (1—Hardly remember it at all ...7—Remember it very vividly). The temporal distance was not predictive of the level of recall: the lowest rating (4.4 for liberal and 4.5 for conservative participants) was given to the 2018 U.S. Election, while the highest rating was received by the 2016 U.S. Election (5.9 for liberal and 5.8 for conservative participants). The level of recall did correlate with ratings of threat: on almost all questions, participants who reported recalling the event better also reported a higher level of threat (on average, liberal participants who recalled an event better perceived its threat across different questions about 0.36 scale points higher; and 0.32 for conservative participants). All our results remain consistent when analyzed separately for participants with better or worse reported recall, so for completeness, we report the analyses based on all participants. The complete results also likely reflect the full range of diversity of reactions to different events among commenters in the real world.
Results
Before describing the results, we should note that all results have a high level of variability on several levels, across news websites, time periods, and different measures of inequality. However, some clear trends emerge in the answers to both of our research questions.
The relationship between the inequality of attention and group threat
Our first hypothesis is that events perceived as a threat to a collective will be associated with higher collective attention to a few high-profile voices, resulting in higher levels of inequality of that collective. To investigate this, we compare our four indices of inequality derived from commenter networks (skewness of in-degree distributions, skewness of Page Rank distributions, the proportion of independent commenters, and the relative number of connected components) with survey ratings of the level of threat perceived to be associated with different events (see “Method” for details). As the pattern of survey results in Fig. S1 in Supplementary Material suggests (panels 3–6), events involving a more specific ingroup-outgroup division (2016 and 2018 U.S. Elections, 2017 Inauguration, and 2017 Charlottesville Rally) tended to be perceived more threatening to the participants’ ingroup than events with a less specific outgroup (2016 Orlando Attack, 2016 Brexit Referendum, and 2017 Las Vegas Shooting; see more details in the caption of Fig. S1).
Figure 1 shows the results of comparing these survey ratings with network-based indices of inequality. Individual measures of inequality (skewness of in-degree and Page Rank distributions, the first two rows in Fig. 1) are positively related to survey ratings of threat to one’s ingroup, for both left- and right-leaning sites, as expected. For the network-level measures of inequality (proportion of independent commenters and the relative number of connected components, the second two rows in Fig. 1), the expected negative correlation with ingroup threat occurs for the right-leaning sites, as expected, but not for the left-leaning ones. Correlation coefficients for all trends and their bootstrapped confidence intervals are shown in Table S3, generally supporting visually observed trends.
Changes in network measures of inequality of attention from before to after events rated as more or less threatening to the ingroups on different news sites. The ratings (x-axis) are summarized as the percentage of participants who estimated that the ingroup on a given site (Democrats for Mother Jones and The Atlantic, Republicans for The Hill and Breitbart) felt more threatened by the event than the outgroup (see “Method” for question texts). Rows show results for different measures of inequality of attention (y-axis) on the individual level (the first two rows) and the network level (the second two rows). The first column shows the hypothesized patterns of results, and the other columns show results for different sites. Numbers correspond to different events (see legend), and patterns are summarized by least-squares fitted lines across events and the Spearman \(\rho \) correlation coefficient above each plot. Colors denote the political orientation of different news sites: dark blue for the leftmost, Mother Jones, lighter blue for left-leaning The Atlantic, purple for the moderate to right, The Hill, and red for the rightmost, Breitbart.
Results for the other two survey measures of ingroup threat show the same patterns (Figs. S5, S6). Results for the measures of personal threat (Figs. S7, S8), and the overall threat to everyone independently of political orientation (Fig. S9), show similar although less strong patterns, as expected given that those types of threat are not critical for the hypothesized relationship between ingroup threat and inequality of attention to ingroup members.
The relationship between the inequality of attention and political extremity
Our second hypothesis is that commenter networks on politically more extreme news websites might show more inequality of attention than networks on more moderate sites. This translates into two hypothesized patterns of results (see the first column in Fig. 2). First, for the individual-level measures of inequality (skewness of individual commenters’ centralities) we expect a roughly U-shaped relationship between the political extremity of the four news websites ordered from ‘very left’ to ‘very right’ and the skewness of centrality distributions. Second, for the measures of network-level inequality, we expect an inverted U-shaped relationship between the political extremity and the proportions of independent commenters and connected components. Because The Atlantic is politically more off-center than The Hill is, the difference between Mother Jones and The Atlantic could be smaller than the difference between The Hill and Breitbart, as sketched in the first column in Fig. 2.
Differences in the overall inequality of attention, across different news websites and events, measured as the skew of centrality indices (first row) and properties of the overall network structure (second row) for the top 1% of commenters. The first column shows hypothesized median patterns of results. Numbers correspond to different events (see legend), and the line to the median trend across all events. Colors denote the political orientation of different sites as in Fig. 1.
As shown in the second and third columns in Fig. 2, there is a quite consistent signal in the data that is roughly in line with the expected patterns, especially for the individual measures of inequality (skewness measures). Specifically, the skewness of distributions of commenters’ centralities is larger for the more extreme political sites than for the more centrally positioned one, The Hill (first row in Fig. 2). These patterns are roughly the same no matter whether the skew is calculated only for the top 1% of commenters (the first row in Fig. 2) or for all commenters (the first row in Fig. S10). The only difference is that when the skew is calculated only for the top 1% of commenters, the skewness of centralities’ distributions is particularly large for the far-right site, Breitbart, suggesting higher inequality of attention on that site compared to the left-positioned sites, Mother Jones and The Atlantic. When the skew is calculated for all commenters, this pattern is less clear, possibly because the changes in measures of skew are obscured when calculated on all comments.
Network-level measures also show slightly more inequality (fewer independent commenters and connected components) for the more extreme left-oriented sites than for the politically more central site, The Hill (the second row in Fig. 2). The far-right site, Breitbart, shows the expected pattern as well, but only for the proportion of connected components, and not for the proportion of independent commenters, where it ties with The Hill.
Of note, there is variability in all indices of inequality across different events, as visible from the dispersion of the events around the median trend lines in Fig. 2. Therefore, it is important to compare multiple measures to evaluate the robustness of the observed trends. For example, although inequality on Breitbart is larger than on other sites for most events, inequality of attention on Breitbart at the time of the 2017 Inauguration appears larger when measured as skewness of Page ranks than skewness of in-degrees. As another example, although the moderate news site, The Hill, followed expected trends, it had lower than expected proportions of independent commenters and connected components for the 2017 Charlottesville alt-right Rally and the 2018 U.S. election (lower than the more extreme news sites, see Fig. 2). This likely reflects the greater diversity of opinions on this moderate news site, with some events evaluated as in line with a more liberal point of view, and others in line with a more conservative point of view.
Further analyses
We next conduct several additional analyses to check for possible distributional and temporal confounds in our data. First, we computed the average “age” (difference in days between the event date and the date a commenter joined Disqus) of commenters participating in discussions before and after different events (first row of Fig. S11 in the Supplementary Material). We calculated the percentage change in the average age of commenters from before to after each event and analyzed how it relates to the event’s threat rating. If on average participants became ‘younger’ after the event, this suggests that new participants who did not comment before have now joined the discussion. In contrast, if they became ‘older’, this means that the discussion is dominated by more experienced participants.
We found that on the left-oriented sites commenters become ‘younger’ on average after more threatening events. In contrast, on the right-oriented site Breitbart, commenters become ‘younger’ after least threatening events for their ingroup, such as the 2016 Election and 2017 Inauguration. This provides a hint about possibly different motivations for signing up for discussions on these sites: on the two left-oriented sites the motivation seems to be ‘solving a problem’, or a threat the ingroup is facing, while on the right-oriented site the motivation seems to be more ‘participating in a celebration’ following an event that’s perceived to be a ‘win’ for the group (e.g. the 2016 U.S. Election).
Critically for our central argument about the relationship of threat and inequality, these age differences cannot explain the relationship of threat and skewness of in-degree and Page Rank distributions shown in the first two rows of Fig. 1. While age changes differ across sites, the relationship between threat and skewness goes in the same direction for all four sites. The age change patterns might have, however, contributed to the different patterns of change in the proportion of independent commenters on the left- vs. right-oriented sites (the third row in Fig. 1). If the newcomers on the left-oriented sites typically come to help solve the group’s problems, they might have been more likely to offer independent advice than the newcomers on the right-oriented sites who came to celebrate their group’s victories. This might partially explain the slightly positive relationship between threat and the proportion of independent commenters on the left-oriented sites, which was not in line with our hypothesis.
Second, we analyzed the relationship between the threat ratings and several measures of activity volume before and after each event: the number of comments per article, the number of commenters per article, and the ratio of the number of comments and commenters. These results are shown in the last three rows of Fig. S11. While the relationship between threat and the number of comments is not strong and consistent, threat ratings tend to be positively related to the increase in the number of commenters. However, because the number of comments does not increase much or at all, there is a largely negative relationship between threat and the ratio of comments to commenters. This seems to support our overall argument that in times of trouble more people focus on fewer comments, and that these comments are likely contributed by a smaller proportion of very productive commenters.
Third, we have conducted extensive analyses of the measures of the volume of activity with all measures of inequality, Fig. S12 in the Supplementary Material shows how different measures of inequality relate to the number of articles posted before and after each event. Figure S13 shows the same for the number of comments, Fig. S14 for the number of commenters, and Fig. S15 for the ratio of the number of comments to commenters. The relationships are largely close to zero, except for a couple of relationships of the number of commenters and measures of inequality. First, likely reflecting the patterns uncovered in the age change analysis above, events attracting more commenters are associated with a higher inequality on the left-oriented sites (where new commenters seem to more often come in times of threat) and a lower inequality on the right-oriented sites (where new commenters appear to come when it is time to celebrate ingroup wins). Second, there is a moderately positive relationship between the number of commenters and the proportion of independent commenters. This makes sense as the events attracting more commenters might be attracting people who otherwise comment rarely and have come to make a fast independent comment rather than participating in a discussion. But overall, these analyses show that our indices of inequality are most likely not driven simply by the volume of activity on different sites and at different times.
Finally, as mentioned before, we have analyzed the frequency with which commenters who posted mostly on one site also commented on the other news sites. While the percentage of such commenters and comments is quite small (see Tables S4 and S5), there are interesting differences between the left- and right-oriented sites. While people who predominantly comment on one of the left-oriented sites (Mother Jones and Atlantic) comment similarly often (though rarely) on each of the other sites (in particular on the moderately oriented site The Hill), people who predominantly comment on the moderate-oriented and right-oriented comment on the left-oriented sites much more rarely than on politically closer sites. That is, commenters on The Hill are much more likely to also comment on Breitbart than on either of the left-oriented sites and similarly, commenters on Breitbart are much more likely to also comment on The Hill than on either Mother Jones or The Atlantic. Although it is difficult to exclude possible adversarial troll activities, these findings are in line with the proposals that the left side of the political spectrum is characterized by a higher openness to diverse experiences64. More relevant for our main argument on the relationship between threat and inequality, Table S5 shows that the overall percentage of comments on each site that are posted by commenters who predominantly post on other sites is very small, and therefore unlikely to affect our main conclusions.
Discussion
Using data on commenting patterns of tens of thousands of commenters during a three-year period, across seven different important societal events and four large news sites, we study changes in the distribution of attention within groups supporting different political options and experiencing real or imagined threats. Unlike in controlled laboratory experiments of network change65, we could use only noisy observational measures of some aspects of relevant group behavior. However, focusing on trends that emerge across seven different societal contexts and individual- and group-level measures of inequality, we observe patterns that are in general agreement with theoretical expectations.
First, we find that groups experiencing real or imagined threat from specific other groups tend to show an increase in inequality of attention, whereas groups experiencing lower threat tend to show a decrease in inequality (Fig. 1). For example, after the 2016 U.S. Election in which Trump won over Clinton, leading to higher ratings of ingroup threat on the left side of the political spectrum, commenters on the left-leaning websites, Mother Jones and The Atlantic, tend to show higher inequality, while commenters on the right-leaning websites, Breitbart and The Hill, tend to show patterns of lower inequality. Similarly, after the 2018 U.S. Election, when Democrats gained control in the House of Representatives, increasing the perceived ingroup threat on the right side of the political spectrum, commenters on the right-leaning websites show patterns of higher inequality of attention, while commenters on the left-leaning website, Mother Jones, show patterns of lower inequality. These patterns are in line with previous theoretical and empirical observations about the effects of outgroup threat on group functioning14,21. They are also in line with sociological accounts of how groups manage uncertainty. In situations of heightened cultural uncertainty that might ensue after critical societal events like those studied here, groups might choose to decrease their social uncertainty by heightening the normative influence of a smaller number of individuals66. Similar trade-offs between cultural and social uncertainty and control have been hypothesized in studies of suicide67 and societal rituals68.
Second, we find that commenters on the more extreme political sites tend to show more inequality of attention than commenters on the more moderate political sites (Fig. 2). The extreme-right site, Breitbart, shows particularly strong inequality of attention measured as skewness of in-degrees and Page Ranks, although only among the top 1% of commenters (Fig. 2 vs. Fig. S10). These findings are in line with the past evidence about the heightened deference to authorities among radical proponents on both sides23,27, but also provide some support to the theoretical perspectives linking authoritarianism with right-wing political extremity26.
Studies of network dynamics have typically investigated the influence of diverse socio-psychological factors in controlled laboratory settings65,69,70. The abundance of online discourse provides a convenient opportunity for studying such factors over tens of thousands of commenters and long periods of time. Analysis of online discussions can yield valuable insights about real-world group dynamics, with many people seeing these discussions as similar to those they have in other platforms and places71, and beliefs and sentiments formed online spilling over into the “real” life72.
An advantage of this study is that it overcomes many of the obvious algorithmic reasons for inequalities in commenters’ attention. Social media platforms employ a variety of algorithms designed to promote content that is more engaging and profitable, and these technologies differ from site to site. Because all four news sites we investigated used the same commenting platform, Disqus, we were able to compare the effects of the socio-psychological factors that influence discussions without such technological confounds. Besides removing possible effects of different commenting interfaces, Disqus is suitable for research because it does not employ any algorithms that personalize the content users see in line with their preferences. As described before, it enables users to change the default sorting order and the moderators to implement different degrees of automated moderation, but these uncontrollable differences are unlikely to introduce systematic biases that would mimic the intricate patterns of the relationship between threat and inequality we found. Our further analyses of possible confounding effects of new users and volume of activity suggest that none of these effects can explain the whole pattern of our results. Further research could also investigate shorter or longer-term changes in commenters’ networks. In this study, we focused on the one month before and after a critical event as this provided us with a sufficient amount of data from all sites. A longer time would have been complicated in the studied period (2016–2018) as many other societally significant events occurred on at least a monthly basis, and with longer time scales, it would become increasingly more difficult to account for them.
Studying the behavior of an adaptive complex social system such as commenter networks on political news websites is extremely difficult. Many factors beyond those that we measured influence commenters’ behavior, and it is not easy to determine the mechanisms underlying some users’ higher popularity. There are probably several aspects of the internal communication dynamics in the comment sections that contribute to consistently more replies received by some individuals. One is that these individuals might be those who comment earlier in the discussion. Another is that some commenters are actually more popular and the other users are more likely to reply to them when they see their comment (even if they do not necessarily search for them), further reinforcing their popularity. During our extensive qualitative research of these sites, we noticed several such popular commenters who often got a lot of replies and were referenced in discussions even when they did not comment themselves. A third mechanism is that—as also glimpsed from our qualitative research—commenters quite often check and comment on others’ profiles and specifically on how many comments they have already posted. Commenters with just a few comments run the risk of being accused of trolling, while those with many comments might be taken more seriously and ‘deserving’ of a reply. A fourth reason is discourse dynamics, that is specific topics and phrases that particular commenters introduce and use. Further qualitative and large-scale natural language processing studies would help better understand the mechanisms driving the inequalities we observe. In particular, it would allow one to investigate whether people who attract the most comments spread their ideas to others or have their ideas criticized, whether they harass others or are harassed, and whether they show other differences in their discourse compared to commenters who attract fewer replies. Importantly, independently of the mechanism by which commenters choose to whom to reply, they can always choose to post an independent comment. The latter choice will affect the inequality of attention to different participants in the discussion.
This study contributes to the broader literature on collective adaptation to societal events, including collective attention (73, emotion74, and memory75). In this large-scale investigation of real-world interactions, we show that collectives adapt to the real or imagined threat from an outgroup by changing their network structure, paying more attention to fewer group members and thus potentially allowing them to have more influence. This can be helpful in the short run to organize a coordinated defense19 but can have adverse consequences in the long run, such as a lower ability to consider diverse views when solving complex problems21. While we used data from a particular type of discourse, given the wide range of threatening events and levels of political extremity we studied, we believe these results are roughly indicative of group reactions in other public discussion contexts.
Data availability
All of the comments data is freely available to download through Disqus API49. The data from survey results are available from the corresponding author upon reasonable request.
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Acknowledgements
This work was supported by a grant from the National Science Foundation (DRMS 1757211). The funder had no role in the study design or interpretation of results. We thank Joshua Garland, Haiko Lietz, Allison Morgan, Henrik Olsson, and Kenan Turbic for their helpful comments.
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N.G.B.T. collected and analyzed the data, and N.G.B.T. and M.G. contributed to presenting the figures and writing the paper. Both authors reviewed the manuscript.
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Bacaksizlar Turbic, N.G., Galesic, M. Group threat, political extremity, and collective dynamics in online discussions. Sci Rep 13, 2206 (2023). https://doi.org/10.1038/s41598-023-28569-1
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DOI: https://doi.org/10.1038/s41598-023-28569-1
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