It's interesting how studies on the negative effects of social media on mental health are mixed: some find an effect, some don't (or only find a very small effect). Some take this as proof that social media is actually fine for mental health. My hypothesis is different. I think that the effects of social media are extremely heterogeneous based on app, population, and dosage: that in some subgroups, some social media apps (when used in high doses) have substantially negative effects on mental...