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Social media was originally all about connecting with people you know in real life. Nowadays some of them are about followers you don't always know, but one way or another you're repeatedly interacting with a select pool of people based on who they are.

Forums have been around longer than the WWW and are more about interacting with topics than with particular members. Some let you follow or PM someone, but that's not the primary function, and HN doesn't even have that. Some social sites have expanded to cover forum-like roles too, like Facebook (Pages).

But most people won't think that far. They'll see HN and say nah, this isn't social media.