The WORST forum I ever went to was on Topix and it was for a health problem.
Some jerk created an account with one name and posted bossy and inflammatory posts, criticizing people for what they were asking, why, just really acting like a NUT. Then he (I think it was a he) posted under multiple names, but you could tell it was the same person because of the wording of the rants. Turns out he was booted off another medical site for being a jerk. This forum had people needing to exchange ideas about health issue, so he was a real detriment. Stay away from Topix, that's the best advice I have. A