MBTI
Typologycentral-meh
INTJforum-I like it, for a J forum.
INFJforum- mostly lurking
ENTP.org-ehh, entps are fun though.
INTPcentral-not anymore, annoys me, as they where the best lab rats I found online, but someone got offended.
Other
pgforum.com(karma forum-highly annoying), photography-on-the.net, fredmiranda.com, dpreview.com(photo stuff), crossdressers.com(for sexual subjects, the group in the middle is imo the best source for unbiased information), Magic lantern(google groups), skyforum.no + more
On these I'm in the range of 20-500 posts. I post if I see something interesting, or have a question or something else on my mind. I consider my presence as flashing, as long as it's not too long, or too much exposed the forums should be fine.