There was a ton of depression and even suicides when I was growing up. I felt like 50% of teens at my large HS were suffering from some kind of mental issue. And then you had major events like Columbine. The US school system has always managed to produce a lot of very miserable people, and no one seemed to care or do anything about it.
And now we have these studies all blaming social media, like there is some kind of epidemic that never existed before. But I am deeply cynical. I think these issues already existed, it's just there is a convenient scapegoat now.