I'm glad early fb was a good experience for you, but studies have found that when fb was just opening to universities, lower grades and higher demand for mental health services would follow.
So I just spent 20 minutes of my life going down this rabbit hole, including the google doc.
Full disclosure: one of my research areas in university was adolescents, and working exactly with these types of studies.
Anyways, the main theme which keeps coming back in this material is that the actual change begain in the EARLY 2010s, which is exactly what I'm saying. My assumption is that basically as social media started to focus more on visual content (photos and videos), people started getting weird feedback about how awesome everyone ELSE was, but you were not. Etc.
Keep in mind that teens are notoriously hard to study, and alot of this material is self reported. Many teens are basically always depressed and suicidal, and or become so for some small reasons such as the results of a report card or other such factor. This is why they are a higher risk group for this sort of stuff than say the average adult. At the same time you can't really shelter them too much, because it's the experiences they gain in adolescence that allow them to build their life toolkit.
Also keep in mind this is just US teens. The rest of the world is -- well -- the rest of the world, so the data cannot really be extrapolated to more than this country.
