I'm not a legal expert (the law bores me terribly), but if someone calls you a skank and you sue them, don't you have to prove that you are, in fact, not a skank?

A lot of the advice on here is good. Instead of not revealing your identity, how about just don't say stuff that could get you in trouble. To me that seems to be the easiest route. Don't defame or call names or anything like that. If there's money to be had by suing then someone will end up suing.