Could it be just a coincidence that young females are exactly the demographic that is constrained by a gender role where aesthetic appeal and social interactions are the most valuable assets? And those are exactly the type of things that social networks exploited, monetized and massively gamified in the last decade?
What's more likely: a rapid change of the cultural norms and roles associated with growing up as a woman or of those related to recognizing and treating mental health issues (all in a single decade!); OR: a purely technical revolution that put interactive screens in the hands of each kid and made the former much more effective in harming their development and leading to the latter?
At least for the young female demographic, I think there is a massive burden of proof for anyone claiming the epidemics is not social-media induced.