Why ban social media when ad-supported media is the culprit? Remove the incentive (to get users to doom scroll, to polarize, to impulse buy…) and you change the behavior. I remember when social media was sane 15+ years ago. The problem is the business model, not socializing. It's crazy to ban it when being a teen is the beginning of socializing!
The ad supported is just the reason to make it addictive. Get rid of all likes/thumbs/follower(counts)/notifications and it loses the endorphins and stops being the problem it is today.
Hey you spent 500ms looking at this pretty girl dancing, how about some ass now?
I get straight up PORN ads on Facebook too. Twitter at some point showed me porn as well, even if I had specifically curated it to show JavaScript content.