ABSTRACT This research explores how users form attitudes when they are presented with online videos and moral comments from their fellow audience. Based on the Heuristic-Systematic Model (HSM) and Moral Foundations Theory (MFT), the study aims to find out how different moral foundations represented in user comments interact with the motivational state, the political orientation, and the moral beliefs of the viewer. In two pre-registered experiments (N = 314 and N = 1015), the inclusion of moral arguments within comments below a YouTube video (harm vs. authority), their valence (positive vs. negative) and the participants’ motivational states (high vs. low impression motivation) were varied. While Experiment 1 revealed no significant effects regarding the persuasive effect of user comments and accompanying moral arguments, Experiment 2 showed a more general effect of comment valence on viewers’ attitude formation. These results help to specify the conditions under which user comments may lead individuals to construct their attitude in a way that fits the perceived majority opinion.
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