Well, there's a fact that idlewords responded to tzs, which could be viewed as a fact about idlewords, a fact about tzs, a fact about both of them, or a fact about this overall conversation, among other things.

For copyright purposes idlewords already has copyright in his post, but I don't think that's the kind of "owning" that we're talking about here.

There's also the fact that, for example, you read what idlewords and tzs had to say to each other, and the fact that some people in the discussion upvoted their comments.

That's already a lot of different sorts of facts about this conversation, and doesn't even reflect everything that HN (or readers) knows.