Screen time in general is correlated with depression ( https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5574844/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC557484

Screen time in general is correlated with depression ( https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5574844/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5574844/ ), so it shouldn't be surprising that specific screen time activities are correlated with depression. It's popular to demonize Facebook, but the reality is that sedentary activities in general are highly correlated with depressive symptoms. This goes both ways: Being sedentary instead of active is unhealthy and can exacerbate depression, and being depressed can exacerbate sedentary behavior. Facebook is just one example of a sedentary activity, but watching TV and using a computer for leisure are also highly correlated with depression. It's entirely possible that Facebook has some unique properties that make it worse than other sedentary time-wasting activities, but we need to be honest that it might simply be equivalent to other sedentary screen time activities in this regard. Without actual data, we're just guessing and projecting our feelings about Facebook onto correlation studies.