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Social Anxiety Disorder (SAD) is a prevalent mental health issue and has been reliably associated with problematic internet use (PIU), an escalating concern. The aim of this study was to evaluate the impact of two theoretically derived internet affordances—seeking social connections online and safety-seeking behaviors online—in this relationship, and to compare their relative impact. Using a sample of 537 adult volunteers and self-report measures, we tested a structural equation model to probe their contributions. Results indicate that individuals with more SAD symptoms tended to use the internet more for both internet affordances, which in turn increased the likelihood of PIU. The relative contribution of safety behaviors in the relationship between SAD and PIU was five times stronger than seeking social connections online. We discuss our results in the context of an affordance-based approach to research internet …