In theory and on paper DH and I fit this profile perfectly. Except we don't. We are 'outsiders' in many respects and fit into 'alternative communities' better than conformity.
The difference I think is that we are early technology adopters.
In terms of the history of new communication technology is there is a phase of great political instability followed by one where people have worked out the tech and its positive and negative impacts and its part of society in a way that's understood.
Its been noted that early tech adopters don't seem to fit the profile they should. You have to ask questions about that.
I also think that issues for teenagers fall at a time where there is both massive communication technology shift and a massive gap in mental health provision and loss of traditional social structures (like religion).
None of this is coincidential.
The places young people would have turned to in the past for support no longer exist and instead community has reformed online but in grouping which amplify problems because people are so similar rather than challenge them by having a multitude of different ways of thinking.
If everyone in your group has the same problem then it's harder to think in different ways to break out of that mentality and research into brains suggests that echochambers changes the structure of our brains and stops us being able to think in critical ways. Imagine this at a formative stage of brain development.
The early evidence does suggest that exposure to different view points can change this though. But we have to understand this and design algorithms accordingly.
The dangerous of concentrated power of social media, is that understanding this, it can be used against our collective interests as a society.
But yes. I don't think we can separate what's happening from social media and niche community groupings.