I think one advantage Hubski has over other sites is that users have complete control over what you see and don't see. You can ignore and follow users, domains, and tags to customize Hubski to be exactly what you want it to be. There is also the mute function which you can read about more here. About a year ago we had a very large influx of users, some of who were troll-y and circlejerky. Their existence was barely noticed by the majority of existing Hubski users. They were quickly ignored, got bored and left. Trolls can't troll if no one pays attention to them. While I don't think there is any perfect solution to the issue of online commenters and trolling I do believe that Hubski has been set up in a way that takes a lot of power away from the trolls and gives that power to the users.