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The purpose of this paper is to discuss the themes identified in the submissions to this volume. The findings are contextualized in recent scholarship on these themes.

The discussion is organized around predicting social media use among candidates, organizations, and citizens, then exploring differences in the content of social media postings among candidates, organizations, and citizens, and finally exploring the impact of social media use on mobilization and participatory inequality defined by gender, age, and socio-economic status.

This volume addresses whether social media use is more common among liberal or conservative citizens, candidates, and organizations; the level of negativity in social media discourse and the impact on attitudes; the existence of echo chambers of like-minded individuals and groups; the extent and nature of interactivity in social media; and whether social media will reinforce participation inequalities. In sum, the studies suggest that negativity and interactivity on social media are limited and mixed support for echo chambers. While social media mobilizes citizens, these citizens are those who already pre-disposed to engage in civic and political life.

This paper explores key topics in social media research drawing upon 60 recently published studies. Most of the studies are published in 2015 and 2016, providing a contemporary analysis of these topics.

This paper examines whether new media can address low levels of political engagement among youth. This paper reports the results of an experiment conducted in 2010 and 2011 where a random sample of participants were exposed to a variety of online news sources. The experiment is unique in recognizing the varied ways in which online news is accessed and acquired by users, including through social networks, and in assessing how different news stories affect political interest. Interest in local politics was higher for youth who were exposed to a variety of online news sources as opposed to those youth who were not exposed to these sources. In addition, use of online news increased political interest, controlling for prior levels of political interest. The results affirm the potential of online news sources to stimulate youth’s interest and engagement in politics.

Climate change is major global policy issue. The news media play a vital role in conveying information about climate change to the public, giving voice to a variety of perspectives as well as outlining policy responses to this issue. However, the growing distrust of news media could lead to dire outcomes on the public's knowledge and policy support related to climate change. This paper uses a mixed method approach (random digit dialing survey, content analysis of newspaper articles) to examine information sources used in learning about climate change, whose voices are presented in climate change discourse, and whose voices are trusted. While news media are the most popular source of information about climate change (n=1207), only half of respondents reported trusting the news media. Scientists are the most trusted source of information (n=1208) and most cited source in news coverage (n=48). Their messages focus on the sources of climate change and the seriousness of this problem. Scientists' messages about climate change are clouded by high levels of distrust in the news media, the primary venue through which their messages are conveyed. In this context, climate change knowledge, level of concern, and support for public policies may suffer.