Scientific Reports 2, Article number: 335 (2012); Published: 29 March 2012; Updated: 2 August 2013

This Article contains typographical errors in the ‘Model description' subsection: ‘In the context of single-agent behavior, our memory mechanism is reminiscent of the classic Yule-Simon model~\cite{yule-simon43, Cattuto3001200744}.’ should read: ‘In the context of single-agent behavior, our memory mechanism is reminiscent of the classic Yule-Simon model43,44’.