If you want automated fact checking you need to create a god. (... and creating a human team that does the same is
playing God)
If you want to identify contagious emotionally negative content you need ModernBERT + RNN + 10,000 training examples. The first two are a student project in a data science class, creating the second would wreck my mental health if I didn't load up on Paxil for a month.
The latter is bad for people whether or not it is true. If you suppressed it by a large factor (say 75%) in a network it would be like adding boron to the water in a nuclear reactor. It would reduce the negativity in your feed immediately, would reduce it further because it would stop it from spreading, and soon people would learn not to post it to begin with because it wouldn't be getting a rise out of people. (This paper https://shorturl.at/VE2fU notably finds that conspiracy theories are spread over longer chains than other posts and could be suppressed by suppressing shares after the Nth hop)
My measurements show Bluesky is doing this quietly, I think people are more aware that Threads does this; most people there seem to believe "Bluesky doesn't have an algorithm" but they're wrong. Some people come to Bluesky from Twitter and after a week start to confess that they have no idea what to post because they're not getting steeped in continuous outrage and provocation.
I'm convinced it is an emotional and spiritual problem. In Terry Pratchett's Hogfather the assassination of the Hogfather (like Santa Claus but he comes on Dec 32 and has his sleigh pulled by pigs) leads to the appearance of the Hair Loss Fairy and the God of Hangovers (the "Oh God") because of a conservation of belief.
Because people aren't getting their spiritual needs met you get pseudo-religions such as "evangelicals who don't go to church" (some of the most avid Trump voters) as well as transgenderists who see egg hatching (their word!) as a holy mission, both of whom deserve each other (but neither of whom I want in my feed.)