Interesting point, they'd have to either give a strict definition or a list otherwise I actually have no idea what to put. What about my ancient XDA Developers account that I don't even remember the username of? Would anyone with a Google account need to give that as YouTube exists?

I would say this is a forum. Is a forum social media?

I always assumed "social media" is something tied to your real-life identity. For me, HN would not be social media.

But there are people here that give their entire life story in their profile, I would say that, for those people, HN is social media.

Though, the Trump regime may see things differently.