I would define social media as having "friends" or "followers" - something that could be used to construct a "social network" or "social graph". IMO HN is just

I would define social media as having "friends" or "followers" - something that could be used to construct a "social network" or "social graph". IMO HN is just a "message board" (for those who actually post - I suspect the majority just visit the front page for some interesting articles and move on)