Or still being quietly run somewhere on BBCode.

Ssssshhhh!!!!!!

Those are the best ones; stop telling everybody about it or they'll get flooded with losers from that orange site I keep hearing about.

You'll note I'm not saying which ones or where they are. ;-)

And the third half on Facebook groups.

As much as I dislike reddit, Facebook groups are awful to use. The interface is such a huge turnoff.

And the fourth half still on their own domains, on some old vBulletin board or something (thinking of car forums mainly, like NASIOC).

That's why some people spend their entire lives on non-english speaking forums.