They're about as insular as the Unitarian church or Hacker News. It's basically an online community where anyone can check in, check out, and leave a comment or an essay. There's no formal structure or membership organization. The people who write or associate there could be edgy pre-teens or prominent math professors, it's really just a self-association thing. There are informal self-organized meetup groups in various cities, but not much different than groups who meet to discuss poetry or literature or video game speed-running. Some ideas have bubbled around more than others, like any memetic spread, but I don't think it's accurate to say that the people who associate there all agree on things, just like HN does not either. And nor is it any more of a clique than HN, or Twitter for that matter, even though you'll find some people on Twitter are more prominent and more vocal than others.

I'm not sure how you thought that comparing them to HN, Twitter and a fringe branch of Christianity would make them sound less insular and clique.

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