because it's general enough that it can be challenged.
I have an amazon profile. The reviews are user generated. They certainly rank popularity into categories.
In fact, I also have a wikipedia user profile as well and there's talk pages and here's the trending topics: https://en.wikipedia.org/wiki/Wikipedia:Top_25_Report
Same goes with youtube, twitch, imdb, discogs, substack, medium, and oh yes, video games. Lots of UGC video games.
Social media can be bad, toxic, unhealthy, lead to suicide and depression among youth, ok. That's certainly terrible but you get a bunch of snazzy lawyers for billion dollar companies that work for the bottom line in the room, this thing won't stand.
Instead what might work better is to extend liability law to such forums of persuasion. It the parents of a dead kid have grounds to sue Facebook and Facebook knows it, they'll pull back quick. It's a page from the Ralph Nader playbook