Representative democracy presents politicians with an information problem: How to find out what voters want? While party elites used to rely on their membership or mass surveys, social media enables them to learn about voters’ issue priorities in real time and adapt their campaign messages accordingly. Yet, we know next to nothing about how campaigns make use of these new possibilities. To narrow this gap, we use a unique data set covering every Facebook post by party leaders and party organizations in the run-up to the 2017 Austrian parliamentary election. We test the hypothesis that party actors are more likely to double down on issues that have previously generated higher levels of user engagement. We also theorize that responsiveness is conditional on major/minor party status and pre-campaign issue salience. The analysis shows that parties’ issue strategies respond to user engagement, especially major parties on low-salience issues. This represents some of the first empirical evidence on how social media can enhance parties’ issue responsiveness.

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