1. COMMUNITY STRUCTURE INCONGRESSIONALCONVERSATION NETWORKSOr, the paper formerly known asRelationships Among Twitter ConversationNetworks, Language Use, and CongressionalVotingLibby Hemphill, Jahna Otterbacher, andMatthew Shapiro

2. What do we expect to see? Interaction with constituents 5,8,10 Polarization, divided communities 1,3,4,8 More activity among Republicans 9 More activity among Senators 9 Similar presentations among men and women 7

3. Legend for graphsEdge PropertiesColor Gray = same party Yellow = different partiesNode PropertiesColor Red = Republican Blue = Democrat Yellow = IndependentShape Solid square = House Solid circle = SenateSize In degreeOpacity Out degree

4. April 12, 2012 Shapiro, Hemphill, and OtterbacherCongress mentioning each other:Excluding self-loops

5. April 12, 2012 Shapiro, Hemphill, and OtterbacherCongress mentioning each other:including self-loops

6. April 12, 2012 Shapiro, Hemphill, and OtterbacherHouse only

7. April 12, 2012 Shapiro, Hemphill, and OtterbacherSenate only

8. Predicting Connections (1) (2) (3) (4) crossparty crosschamber crossparty crosschamberRepublican -0.308*** 0.107** -0.325*** 0.0908** (-12.86) (3.27) (-13.15) (2.71)Senate 0.172*** 2.715*** 0.180*** 2.724*** (5.46) (74.83) (5.69) (74.48)Male 0.0925** 0.0944* (2.79) (2.12)_cons -0.230*** -1.943*** -0.299*** -2.014*** (-12.21) (-71.46) (-9.62) (-46.26)N = 29,597t statistics in parentheses* p < 0.05, ** p < 0.01, *** p < 0.001

9. Results Low density indicates low cohesion 6 Republicans, Senators, and males more likely to mention across chambers Senators and men more likely to mention across party lines Conservatives mention each other more 1 Explicitly engage small subset of those under surveillance 2

10. Takeaways New medium, not new behavior 11 Congress less polarized than political blogosphere 1 Echo chamber more than broadcast medium

11. Contact us Libby Hemphill (libby.hemphill@iit.edu) Jahna Otterbacher (jotterba@iit.edu) Matt Shapiro (mshapir2@iit.edu) Illinois Institute of Technology info@casmlab.org http://www.casmlab.org/projects/publicofficials/

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