Sorry for my ignorance, but what exactly is the distinction between hn and social media? Is it the personalization that distinguishes the two? Does "social" mean "feed depends on graph neighborhood"? So collaborative filtering + ranking algorithms + moderation is not social media until you add graph neighborhoods?

I would say yes, that's a good way to make the distinction. It's even more than that: the feed is different for every single user.

With a site like HN, everyone sees the same front page at a given time. What makes it to the front page is primarily determined by all users voting up articles or moderating them. Yes, there's some algorithmic sauce behind it that weights votes and flags differently based on some other criteria, but the dominating factor is user votes and flags. And, again, everyone sees the same ordering of articles if they load the page at the same time.

HN is centered around topics and articles. Social media is centered around individuals and what they personally choose to post and promote.

That'd be the thing indeed.

hn is largely a technology oriented link aggregator with discussions, and probably some would also classify it as a forum. Or as social news site as goes on wikipedia among fark, slashdot and reddit. But beside a voting system, simple profiles there's nothing else - this is nearly an experience unlike anything large social network services offer.

A typical social media platform mainly exists around main stream/feed, sharing content and building profile or groups dedicated to particular topics or around known brands. That's of course the perfect unstained image because everything falls apart when we start getting into the details, such as algorithms in the work, content quality and moderation and so on.

I think the distinction is pretty easy imo. HN is topic centered, Social Media is person-centered. Before MySpace there was a pretty big proliferation of forums and other topic centered discourse. The profile was such a minor part of those tools.

When MySpace came out, the profile was the home page for a lot of people, and the content orbited around that. Coupled with the mass movement to represent oneself faithfully online as in the real world, (maybe for banking, maybe for surveillance), I think social media sort of operates as a trap. On facebook, you are encouraged to upload your real photos of drunken night out, family vacation, or whatever IDs you in life. On LinkedIn this is mandatory, your "avatar" must mirror your physical self. I have a lot to say on this, but I think I'll just leave it at topic vs profile.

A big difference is that its culture comes from shared public experience. Everyone sees the same front page not a curated one.

well moderation is ubiquitous , but yeah -- personalization/targeting/social graph are essentially the things that people expect out of a social media platform.

I do personally think the karma thing is an aspect , because it's gamed everywhere to huge advantage -- but the altruistic view is that its a branch of moderation, an effort to democratize the removal of obviously bad actors while still facilitating dissenting or contrary speech.

I also know that's a naive view.

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