HN is very actively moderated, so I think it might be able to exist. And presumably things like comment sections would generate “consequences” similar to radio stations that pay relatively small fines when live guests on air say “indecent” things.
I think it’s possible that Facebook and Twitter, etc. could not exist under that threat of legal liability. A few years ago I would have said that was unbearable, but now I’m not so sure. The flat earthers and anti-vaxxers of the world worry me. I don’t think they should be prohibited from speech by any stretch, but Facebook and Twitter engagement algorithms lead to echo chambers that amplify radicalism and research has shown how that directly leads to an increasingly angry, divided, polarized citizenry.
It’s one thing if we are angry and divided about truth. It’s another if entire cohorts of the population no longer believe in objective reality because the Facebook algorithm serves them a never ending stream of anti-vax untruth. And much worse the hate groups that lead to “doxing” and worse.
I don’t know what the appropriate answer is, but I don’t think that the status quo is trending in the direction of a better future for humanity, and I think it’s good for us to be asking tough questions and possibly reconsidering whether some of the newer technologies like social media are, on aggregate, worth the harm they cause.