I think the issue with social media is more to do with the way the platform's algorithms drive user engagement than with social media itself. For instance, I find twitter to be quite useful, but making it useful required me to curate the accounts I follow and disable the algorithmic suggestions. A lot of people don't change those defaults, and I can easily see how that could be distressing.
Even very smart people who are aware of this fact continue to justify it, in the name of "I need it for work" and "I learn a lot from <niche> Twitter". We're entrenched in it and it's not always feasible to "just leave", regardless of its subconscious effects.<p>I was anxious <i>about leaving</i> Facebook when I did (2013) because I thought I'd basically be forgotten when it came to event invitations. I'm glad that enough people have ditched Facebook that the concept of only sending invites via Facebook has stopped being a thing.