I dabble in a lot of different social media sites, reddit being one of them. I've all but abandoned reddit only partly because of the pervasive groupthink. I figure I'm smart enough to sniff out that kind of thing, just as a savvy user can detect shills and most other frauds.
In fact I've severely downgraded reddit mainly due to the extreme immaturity and insecurity the users there exhibit. The users there don't merely disagree with you. They ignore facts and sources presented. They insult you without knowing a thing about you and usually also without knowing much about the topic at hand. They get their friends to gang up on you to do the same, then make whole new comment threads to mock and insult you. Then they stalk your posting history to make further personal attacks. Pleas to board moderators and site administrators to stop individual and group harassment go completely unanswered, probably because they are too busy focusing on problems of institutional harassment of entire subpopulations. Witness /r/fatpeoplehate. Banning that board was the right thing to do, and it was a good first step in the process; let look how much drama and strife that created.
I've recently become wary of some of the other sites I visit owing to reddit refugees migrating in groups. For instance, voat.co looks to be a good alternative on the surface. But after a few minutes of looking around, you see threads like this and you realize that all the worst users which reddit tried to eliminate with their recent rule changes went to voat where there are (as yet) no such rules.
Hubski I find to be mature and thoughtful, which is something I value very much.