> User-voted: Social media

I don't think user voting automatically makes something social media. I think there's a blurry line between voting/"likes" and user-driven moderation.

User-driven moderation can certainly develop aspects of a popularity contest like social media has, but often it looks like a somewhat hopefully objective assessment of the quality of a comment, regardless of whether or not the moderator agrees with the point the commenter is making.

I'm not saying that HN's user moderation is fully objective. It certainly isn't; I don't fully moderate that way, myself, even. But HN's user moderation is absolutely not the same as the liking done on a Facebook post or its comments.