I'd maybe put the doubling of rent every decade up there at the top as the thing that causes the most mental health harm. I'm in my late 30s and remember moving to NYC in 2007, when seeing two bedroom apartments in Brooklyn for $1200/month seemed expensive but doable. Now I hear of young people paying that for a room in a shared apartment, or end up moving back in with their parents. Add to that other costs of existing plus their student loans and it's got to make young people feel on the edge all the time.

Not to say that social media isn't bad for mental health, it certainly is. But I've been out in NYC and seen swarms of young people at bars and clubs, it's not like they're not socializing with each other.