An effective "semi-ban" would be to force strong authentication for all non-sewer social media sites.
We already received fact-checks and community notes on social media content. What else do we need? Aaron Swartz proposed freedom of speech: http://www.aaronsw.com/weblog/becausewecan But banning, fact-checking, and community notes interfere with free speech. Especially when the government gets involved.
non-sewer?
Everything above 4chan, I mean.
There's lots of single-topic social media sites. Do a web search for your favorite hobby and "forum" and you're likely to five something.
It's the only kind of social media I use, because I've never had any interest in keeping up an account to talk about myself.