"It’s not because of the Global Financial Crisis. Why would that hit younger teen girls hardest? Why would teen mental illness rise throughout the 2010s as the American economy got better and better? Why did a measure of loneliness at school go up around the world only after 2012, as the global economy got better and better? (See Twenge et al. 2021). And why would the epidemic hit Canadian girls just as hard when Canada didn’t have much of a crisis?"

He is admittedly open to other ideas, but claims that no one to date has been able to provide a explanation for the upticks depression and mental health issues which disproportionately impacts young, pre-teen girls and is seen across many developed countries.

[1] https://jonathanhaidt.substack.com/p/social-media-mental-ill...