I wouldn't say INTPc has cliques so much as it has a few demigods. Some good and some evil. And the madmins are sort of a necessary clique.
I'm having a really hard time thinking about what topics really, really couldn't work at INTPc. Of course there's going to be people trying to shit on your tea party (or merging your threads), but we just had two long ones about religion and generalized faith that actually weren't mostly flames/smartass comments.
If you can make it interesting to us (huge caveat), we'll pretty much roll with any topic within reason. Even intelligent or creative (or sometimes not) fluffy shit. I think if you can handle a handful of people being immature on any given day without getting raged, you could pull off any topic at INTPc. INTPs are just really good at getting under the skin, so that could be easier said than done for some OTs. There are always tons of people willing to give constructive input, perhaps with small barbs attached.
Summary: if what you expect from a forum experience is a cross between speech & debate and a cuddle puddle, then you'd better be INTP if you think you'd like INTPc.
EDIT: ptg, if what you meant by "cliques" was "forum drama", then we have a dangerous cycle with that, sure.