Abstract
ABSTRACT This article examines whether the persuasive potential of modality interactivity on anti-smoking websites can be harnessed by adding agency affordances, such as the like, comment, and share features. Using a 2 × 2 factorial experiment with a current smoker sample (N = 154), we investigated the interaction effects between modality interactivity (low vs. high) and agency affordances (absence vs. presence) on persuasion outcomes. The results showed that the effects of modality interactivity on telepresence, systematic processing, and change in quitting intentions varied depending on the existence of agency affordances on the website. Agency affordances on the anti-smoking website led to a greater sense of agency and systematic processing on the website content. Only in the presence of agency affordances did modality interactivity enhance the feeling of telepresence, which led to greater quitting intentions than in the control condition. Without agency affordances, modality interactivity diminished systematic processing, leading to lower quitting intentions.
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