Liberals Engage With More Diverse Policy Topics and Toxic Content Than Conservatives on Social Media

The rise of social media provides citizens with direct access to information shared by political elites. Yet, more than ever before, citizens play a critical role in diffusing elite-generated content. What kinds of content spread on social media? Do conservative and liberal citizens differ in the elite content with which they engage? These questions relate to long-standing academic and popular debates about whether political behavior is symmetric or asymmetric with respect to political ideology. We analyze more than 13 million users’ retweets of messages by U.S. Members of Congress on Twitter from 2009 to 2019, leveraging estimates of users’ political ideology constructed from over 3.5 billion prior retweets. We find limited evidence for ideological symmetry where the strength of ideology predicts diffusion choices similarly, on the left and right. In contrast, we find robust support for ideological asymmetry. Consistent with theories of ideological asymmetry, liberals retweeted a more diverse set of policy topics than conservatives by 19.4%. They also engaged more with toxic content from in-group elites by 56%. Given the tendency for people to follow like-minded others on social media, these diffusion patterns imply that liberals are exposed to more politically diverse and toxic elite-generated content on social media, while conservatives receive more politically homogeneous and less toxic content. The demand and supply dynamics of political information suggest the existence of divergent polarized information bubbles such that liberals and conservatives reside in distinct information ecosystems.