Devil's advocate: what is the difference between "social media" and a website very much like this one? When can I look forward to having to give a DNA test to read HN?
The main difference in my view is the personalized algorithm that determines what to feed you next.
HackerNews has an algorithm but it's not personalized—i.e. everyone sees the same thing.
From a definition standpoint, hn is a social media site. From a legislation standpoint, it's not nearly popular (infamous?) enough to legislate (the mentioned sites have had enough negative coverage to manufacturer consent for this invasion of privacy: cyber bullying, destructive challenges, etc.)
When it is, and when your local government becomes sufficiently captured by the user surveillance industrial complex, you will need real world verification here.
> what is the difference between "social media" and a website very much like this one?
Pretty much everything? Not the same intent, not the same usage, not the same business model, not the same users, &c.
Proper moderation, and - how to say it without sounding elitist? - more mature users.
the services that comply with speech suppression and privacy violation orders will be deemed acceptable, and those who don't won't.
None. HN is a social media since it's an online forum. In fact HN runs afoul of many EU regulations already, GDPR, cookie law, ...