Personally I'd just like to see _any_ kind of federated social network system that gets some market share. Kind of like how email is federated. Doesn't really matter to me the feature set. My thought is, if one could get to some kind of adoption, folks might see how much better things could be. You'd get to select your own "onramp" to the social network, follow people the same way you do on email (I'm following sfblah@hackernews or whatever), etc.
Good question. I guess things like a comment/like/reply mechanic. And, RSS feeds don't really have a topological linking mechanic as far as I know. I mean, this stuff doesn't seem that hard. It's just that users prefer the walled garden approach, which is too bad. Email came around early enough to avoid that. If email were invented today, it would work like Snapchat or Slack or whatnot. Email is a much better system IMO.
