alt Hacker News> HN is not social media in any normal sense of the word.
The article's main claim is that traditional social media is not social media any more. That Facebook et al are now junk entertainment. So IMO HN hews much closer to the traditional role of social media than Facebook et al do.
That's what I took away from it, too. Facebook circa 2008 was great: your friends talked what were up to; everyone posted their pictures from that party last night; you didn't see anything from anyone who wasn't at most a second-degree connection. There were problems - people were jerks, and worse, and some people got pulled into chasing clout, and promoted bullshit - but they were human-scale problems, and you could largely scrub your feed from things / people like that. Unfortunately for the entire world, that sort of use wasn't profitable enough.