> The Wikipedia definition isn't complete, otherwise Wikipedia itself is social media too.

Actually, that's a decent point; it should probably add something about being primarily focused on the user interactions. That is, Wikipedia isn't social media, but I'd hesitate to say that the talk pages aren't.

> Basically nobody outside of HN would consider HN social media if they saw it.

And on that point we definitely disagree, though I suppose I could ask around. What do you think makes it not?