My own personal observation is people who are totally absorbed in social media are socially anxious and awkward, don't engage in conversation except about things that are in their very narrow areas of interest, and tend to suddenly get heated or "triggered" very quickly when exploring those subjects.
There really is no such thing as "casual conversation" with them. You're either engaging in total mind-meld or you're completely ignored. I don't understand that mindset, so I'm keeping an open mind, but I don't see how that can't trap a person into a rigid and boring life, where you're confined to your home most of the time and only engage with people who share 99% of your opinions about things that only affect you in a marginal way.
Thankfully at least my imagination can step out of this reality. I can see a scenario where people are spread thin and just use remote conversation instead of in-person.
I can see a world where politics and profiteering don't end up in the way of quality communications tools.
It's kinda hard to imagine a society where all meaningful interaction takes place online that's not massively depressing.