I've been using Twitter, but perhaps not in the way it's intended.
Basically, whenever someone follows me, I take a quick look at their post timeline, and if it is at all reasonable I follow them back. (If they aren't posting, or seem to be a marketer, I don't.) That's normal, I think.
Then, however, I diverge from the social contract. I've learned some interesting things, seen many well-intended, positive posts, and understand that there's a community there.
But I can't help myself: the minute someone posts something naive and stupid, or otherwise idiotic, my radar switches on. If they do it again, I enjoy a slight frisson when unfollowing them.
It's fun: one minute, their quoting some idiot motivational speaker, the next, they are no longer in my universe.
Of course, people might do the same to me, and I'll end up with no followers. I'd be fine with that.