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This article relies on U.S. 2‐wave panel data to examine the role of social media as a sphere for political expression and its effects on political participation. Informational uses of social media are expected to explain political expression on social media and to promote political participation. This study clarifies the effect of using social media for social interaction in fostering political expression and participation processes. Results indicate that social media news use has direct effects on offline political participation and indirect effects on offline and online political participation mediated via political expression. Furthermore, social media use for social interaction does not have direct influence in people's political engagement, but rather an indirect effect by means of citizens expressing themselves politically.

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With social media at the forefront of today's media context, citizens may perceive they don't need to actively seek news because they will be exposed to news and remain well-informed through their peers and social networks. We label this the "news-finds-me

Empirical studies of citizen communication networks and participation go as far back as the 1940s, with a bolder focus in political—not civic—activities. A consistent finding reveals that individuals with larger networks are more engaged than those with smaller networks. This article expands this line of work with a number of novel tests. First, it compares the predictive power of online versus offline network size on civic engagement. It then explores the role of strong-tie versus weak-tie discussion frequency and participatory behaviors. Finally, it examines the extent to which the contribution of network size, both online and offline, on civic engagement is mediated by discussion with weak ties. Using original survey data from a large national sample of U.S. adults, results indicate that (1) the relationships between online and offline network size and civic engagement are positive and fairly similar in strength, (2) weak-tie discussion is the strongest predictor of civic behaviors, (3) weak-tie discussion largely mediates the association between participation and network size online and offline, and (4) online networks entail greater exposure to weak ties than offline networks.

Using original national survey data, we examine how social media use affects individuals' discussion network heterogeneity and their level of civic engagement. We also investigate the moderating role of personality traits (i.e., extraversion and openness to experiences) in this association. Results support the notion that use of social media contributes to heterogeneity of discussion networks and activities in civic life. More importantly, personality traits such as extraversion and openness to experiences were found to moderate the influence of social media on discussion network heterogeneity and civic participation, indicating that the contributing role of social media in increasing network heterogeneity and civic engagement is greater for introverted and less open individuals.