It is, but that's why I said "certain social media". Not trying to do it all. If HN started substituting for Facebook, I'd be worried, but that doesn't seem to be happening.
I think of it more in terms of deliberately addictive behavior. HN is fun, but it doesn't have basic functions like infinite scrolling. The closest it has to addictive social media behavior is the upvote/downvote buttons. (See Cal Newport's Digital Minimalism for discussion about that problem.)
Don't you consider HN to be social media?