I think there are important differences between news forums like this one and social media:
- HN doesn't have notifications
- HN doesn't provide affordances for virality: you can't "retweet"/"subtweet"; you can't start trends like #ProtectTaylorSwift; you can't brigade people; etc
- HN doesn't have a personal algorithmic feed
- HN doesn't have DMs
- HN links elsewhere (mostly) for the main content
- HN's moderators are available directly, and they also participate in discussions
- You can't be an influencer on HN: you might be a patio11 or something, you might even get jobs from your HN karma or posts, but hawking products based on your clout for a kickback is astroturfing/shilling and the community is pretty good at snuffing it out
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I guess overall my argument is that if forums--even forums like Reddit or random vbulletin forums--are social media then the term kind of loses meaning. It opens the door to questions like "are blogs social media, after all there are accounts and comments sections".
I know people highroad social media and its users a lot (I'm guilty of this haha; finally my misanthropy is good for something!), so there's something attractive about an argument that cuts holier-than-thou HNers back down to size (trying to be generous and lighthearted here, again I'm a member of this crew). I just think the shoe doesn't fit in this case. There are good things about social media! Black Twitter! Queer/Geek Mastodon! But I really feel like those services are meaningfully different than forums--especially this one.