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In 2020 alone, social-media shares, likes and similar interactions with misleading online news doubled to 17% of all engagements. This staggering growth has consequences: polarization, violent extremism, racism and resistance to climate action and vaccines. Social-media companies have taken some steps to combat misinformation by using warnings and ‘sticks’, such as removing a few virulent spreaders of falsities and flagging misleading content. Facebook and Instagram users can report concerning posts, and Twitter prompts users to read articles before retweeting them.