Media credibility, ideology, internal efficacy, and political expression are explored in this study. Trust in online information is tested as a predictor of online political expression on social networking sites (SNSs). Findings show that three unique processes are at work when predicting online political expression. First, internal search efficacy moderates the relationship between trust and
... [Show full abstract] online political expression. Second, the relationship between trust and political expression is also moderated by strength of ideology. Third, strength of ideology moderates the relationship between internal search efficacy and online political expression. These results imply that there are more ways for strength of ideology to affect the online information environment than non-political variables, which has the potential to skew the tenor of the online information environment toward extreme perspectives. Key implications are discussed.