AI is pretty much killing social media in the long term. Even pre-AI, a good chunk of posts/comment sections on sites were bots/paid. Reddit is becoming less believable than ChatGPT. I guess there's still the Onion-verse.
I'm not convinced you can have an impromptu global conversation to any positive end. Humans are not well suited to this task and an unsupervised mostly anonymous forum plays to those weaknesses and provides no support to generate positive outcomes. It was never a particularly good idea at the scale it's currently deployed at.
This human nature shit is empirically wrong. There are quite a few scammers around. You also meet these people in real life, you just don't notice immediately.