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During the 2012 federal election cycle, we collected Twitter conversations about 10 controversial political topics and mapped their network ties. Using network analysis, we discovered clusters\u2014subgroups of highly self-connected users\u2014and coded messages in each cluster for their expressed positive-to-negative emotional valence, level of support or opposition, and political leaning. We found that valence-based homophily successfully explained the selection of user interactions on Twitter, in terms of expressed emotional valence in their tweets or support versus criticism to an issue. It also finds conservative voices to be associated with negatively valenced clusters and vice versa. This study expands the theory of homophily beyond its traditional conceptualization and provides a new understanding of political-issue interactions in a social media context.<\/jats:p>","DOI":"10.1177\/1461444814555096","type":"journal-article","created":{"date-parts":[[2014,11,4]],"date-time":"2014-11-04T00:30:17Z","timestamp":1415061017000},"page":"1382-1400","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":95,"title":["Valence-based homophily on Twitter: Network Analysis of Emotions and Political Talk in the 2012 Presidential Election"],"prefix":"10.1177","volume":"18","author":[{"given":"Itai","family":"Himelboim","sequence":"first","affiliation":[{"name":"University of Georgia, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kaye D","family":"Sweetser","sequence":"additional","affiliation":[{"name":"San Diego State University, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Spencer F","family":"Tinkham","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kristen","family":"Cameron","sequence":"additional","affiliation":[{"name":"University of Georgia, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Matthew","family":"Danelo","sequence":"additional","affiliation":[{"name":"Media Consultant, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kate","family":"West","sequence":"additional","affiliation":[{"name":"University of Texas in Austin"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2014,11,2]]},"reference":[{"key":"bibr1-1461444814555096","doi-asserted-by":"crossref","unstructured":"Adamic L, Glance N (2005) The political blogosphere and the 2004 U.S. election: divided they blog. 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