Calling this out as the primary reason HN is not social media. Forums existed for years before social media was ever a thing. HN is indistinguishable from a forum in the early 2000s.

Forums of the early 2000s were almost always sorted by recency, not upvote count. They also typically weren't dominated by vendor press releases and news stories, whereas domains such as anthropic.com, blog.google, openai.com, along with outlets such as techcrunch.com and arstechnica.com, are probably among the most popular URLs of the past year.

But I don't think it's a meaningful distinction to begin with. Usenet was an endless time sink to get angry at things that didn't matter and argue with strangers who might not even be real people. It wasn't monetized, but it still made it easy to waste years of your life.

The fact that they intentionally include a rightthing/wrongthink button and keep score is a fundamental difference between modern "social media" and legacy BBSes and forums where there was no score keeping. Perhaps keeping score of rightthink is not enough to make HN social media, but it's certainly enough to not put it in the same bucket as forums and BBSes