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We investigate how commenting on policy-relevant posts in social media affects the opinions of the commenters themselves (“self-effects”). Specifically, we examine whether writing comments affects the valence and strength of pre-existing opinions, and how commenting in congruent or incongruent opinion environments influences these self-effects. An online survey experiment shows that writing comments reinforces prior opinions. Self-effects were strongest for participants who had no clear previous opinion, but commenting in congruent or incongruent opinion environments did not influence self-effects. The findings advance our understanding of online discourse and its implications for public opinion, showing that online expression shapes beliefs about socially relevant issues.
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