Political discourse on social networking

The news feeds of two U.S. politicians’ Facebook sites were examined across 22 months leading up to an election 6 in order to explore changes in social-network-mediated public political discourse over time. Changes over time were observed 7 in who was being addressed and in the affective valence of comments. A complex flow of attention between in-group and 8 out-group concerns was observed with in-group comments dominant both in early and late phases. Also, positive comments 9 decreased and negative comments increased over time. These phenomena, dubbed “reflection-to-selection” and “converging 10 sentiment”, were refined to explain the observed nonlinearities. The flow of rational versus affective comments in politicians’ 11 Facebook data across time was also explored. Comments reflecting cognition were more prevalent at all times than comments 12 reflecting affect, but their distribution also varied in complex ways over time. Finally, the concept of “potential public sphere” 13 in contrast to “realized public sphere” in virtual spaces is introduced. 14