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We use a stream of 14\u2009million messages on Twitter to note how its reach equals that of television. Next, we demonstrate the interactive communication characteristics of social media in the use of hashtags, retweets, and shared URLs. Finally, we draw upon data from Lexis-Nexis on newspaper stories and broadcast transcripts to emphasize the different ways social and mainstream media constructed the story about surveillance and interacted with each other. We conclude agenda setting can no longer be understood as a monopoly of the mainstream media, indexed to the actions of political elites. Social media, through its reach, interaction, and broadening of ideas brought into the discussion, emerge as a distinctive mode of large-scale communication. Giving voice to the people introduces an entirely new dimension to agenda setting.<\/jats:p>","DOI":"10.1177\/1461444815616226","type":"journal-article","created":{"date-parts":[[2015,12,11]],"date-time":"2015-12-11T21:19:19Z","timestamp":1449868759000},"page":"1916-1934","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":37,"title":["Agenda setting in the twenty-first century"],"prefix":"10.1177","volume":"18","author":[{"given":"GR","family":"Boynton","sequence":"first","affiliation":[{"name":"The University of Iowa, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"suffix":"Jr","given":"Glenn W","family":"Richardson","sequence":"additional","affiliation":[{"name":"Kutztown University of Pennsylvania, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2016,7,9]]},"reference":[{"key":"bibr1-1461444815616226","doi-asserted-by":"publisher","DOI":"10.2307\/1952796"},{"key":"bibr2-1461444815616226","volume-title":"Power and Poverty","author":"Bacharach P","year":"1970"},{"key":"bibr3-1461444815616226","doi-asserted-by":"publisher","DOI":"10.2307\/2939040"},{"key":"bibr4-1461444815616226","doi-asserted-by":"publisher","DOI":"10.1017\/S0003055402004252"},{"key":"bibr5-1461444815616226","doi-asserted-by":"publisher","DOI":"10.1086\/268900"},{"key":"bibr6-1461444815616226","volume-title":"News: The Politics of Illusion","author":"Bennett WL","year":"1983"},{"key":"bibr7-1461444815616226","doi-asserted-by":"publisher","DOI":"10.1111\/j.1460-2466.1990.tb02265.x"},{"key":"bibr8-1461444815616226","volume-title":"Mediated Politics: Communication in the Future of Democracy","author":"Bennett WL","year":"2001"},{"key":"bibr9-1461444815616226","doi-asserted-by":"publisher","DOI":"10.7208\/chicago\/9780226042862.001.0001"},{"key":"bibr10-1461444815616226","doi-asserted-by":"publisher","DOI":"10.1017\/S0143814X98000038"},{"key":"bibr11-1461444815616226","doi-asserted-by":"publisher","DOI":"10.1080\/17512786.2013.802481"},{"key":"bibr12-1461444815616226","doi-asserted-by":"publisher","DOI":"10.7208\/chicago\/9780226065601.001.0001"},{"key":"bibr13-1461444815616226","doi-asserted-by":"publisher","DOI":"10.4018\/978-1-4666-6062-5.ch008"},{"key":"bibr14-1461444815616226","doi-asserted-by":"publisher","DOI":"10.4236\/ojps.2013.33013"},{"key":"bibr15-1461444815616226","doi-asserted-by":"publisher","DOI":"10.4236\/ojps.2014.41002"},{"key":"bibr16-1461444815616226","doi-asserted-by":"publisher","DOI":"10.2307\/j.ctt6wrbqk.13"},{"key":"bibr17-1461444815616226","doi-asserted-by":"publisher","DOI":"10.2307\/j.ctt6wrbqk"},{"key":"bibr18-1461444815616226","volume-title":"Participation in American Politics: The Dynamics of Agenda-Building","author":"Cobb R","year":"1972"},{"key":"bibr19-1461444815616226","volume-title":"The Press and Foreign Policy","author":"Cohen BC","year":"1963"},{"key":"bibr20-1461444815616226","doi-asserted-by":"publisher","DOI":"10.1086\/268764"},{"key":"bibr21-1461444815616226","volume-title":"Governing with the News","author":"Cook TE","year":"1998"},{"key":"bibr22-1461444815616226","doi-asserted-by":"publisher","DOI":"10.2307\/2111732"},{"key":"bibr23-1461444815616226","doi-asserted-by":"publisher","DOI":"10.4135\/9781452243283"},{"key":"bibr24-1461444815616226","doi-asserted-by":"publisher","DOI":"10.1177\/009365087014001006"},{"key":"bibr25-1461444815616226","doi-asserted-by":"publisher","DOI":"10.1177\/107769906003700301"},{"key":"bibr26-1461444815616226","doi-asserted-by":"publisher","DOI":"10.1017\/S1537592710002069"},{"key":"bibr27-1461444815616226","doi-asserted-by":"publisher","DOI":"10.2307\/2110923"},{"key":"bibr28-1461444815616226","volume-title":"Projections of Power: Framing News, Public Opinion, and U.S. Foreign Policy","author":"Entman RM","year":"2004"},{"key":"bibr29-1461444815616226","first-page":"203","volume-title":"Mediated Politics: Communication in the Future of Democracy","author":"Entman RM","year":"2001"},{"key":"bibr30-1461444815616226","first-page":"139","volume-title":"The Evolution of Key Mass Communication Concepts","author":"Glynn CJ","year":"2005"},{"key":"bibr31-1461444815616226","doi-asserted-by":"publisher","DOI":"10.1177\/107769907605300416"},{"key":"bibr32-1461444815616226","unstructured":"Hosenball M (2015) U.S. to stop collecting bulk phone data if spying law expires. 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