And there's not an algorithm, it's just who you follow, and you can follow cross-server.

Right, I'm just wondering how that works when you piss somebody off (as will inevitably happen) and they launch the botnet to down-vote your server everywhere, and then the cross-server stuff stops working because nobody trusts you anymore. I mean, I'd like to think they've given this some thought and learned various lessons since PGP, but I don't know if they have...