So, a slightly more optimistic way of looking at it is that investors think that other investors think that there's a dark future ahead, but may not believe so themselves. It's quite possible that no one really believes in that particular dystopian future, but everyone thinks that everyone else does.
It's fairly easy to imagine monetisation strategies that could be pretty negative in the long term.
Blackmail me based on private conversations?
Resell my photo uploads to shutterstock?
Charge the intelligence agencies $1k per user for a backdoor to my encrypted FB chat messages?
They could become the whole internet. In many places they already are. This is a very sad future for someone who sees the internet as a tool of human liberation and direct connection.
I don't care so much about them selling our information. It's worthless even to me. These other things are much more subtle and valuable.
Or, as we used to called it in my day, not actually socializing.
Digital is a nice way to keep touch or contact new people, but bad replacement for physical socializing. Of course it's also easier and needs far less commitment, courage and empathy, and you can't beat that for people...
I worry that I see it as over-hyped because of my discomfort in the future it proposes. Its valuation represents the market's belief in what I feel is a very dark future.