I'd guess these poor teenagers were mentally sick of something else before the social networks thing came to be. And they will be sick of another thing after social networks get replaced.
Important thing is that we have developed rules that parents teach to kids in regards to many things, but we've developed those rules for centuries, now with internet we need generations before kids will be ready to dangers of internet as good as they are prepared for the dangers of the street for example. Damn we still have bullying in schools, because schools are around just recently, like 100+ years, we have not adapted yet.
Important thing is that we have developed rules that parents teach to kids in regards to many things, but we've developed those rules for centuries, now with internet we need generations before kids will be ready to dangers of internet as good as they are prepared for the dangers of the street for example. Damn we still have bullying in schools, because schools are around just recently, like 100+ years, we have not adapted yet.