The uncertain first-time voter: Effects of political media exposure on young citizens’ formation of...

<jats:p>The digital media environment changes the way citizens receive political information, also during an election campaign. Particularly first-time voters increasingly use social media platforms as news sources. Yet, it is less clear how accessing political information in such a unique social setting affects these cohorts’ decision-making processes during an election campaign, compared to experienced voters. We compare effects of these two groups’ political information exposure on their vote choice certainty during the 2015 Danish national election. We furthermore test how the relation between exposure and certainty can be mediated by active campaign participation. An 11-wave national panel study was conducted, using a smartphone-based assessment of citizens’ ( n = 1108) media exposure and vote choice certainty across the campaign period. Results suggest that first-time voters’ social media exposure is responsible for their increase in certainty as the campaign progresses, while this effect is absent for experienced voters.</jats:p>