My friend wants me to warn people about her recent ex, because he's a sociopathic, lying, philandering SOB. While I agree that no more women should be sucked into his stories and lies, I'm a bit hesitant to spread dirt. (And I could so easily, because he's cop and I have friends in his detatchment.)
I'd definitely pass on that one.....unless it came down to him dating someone I cared for. Other than that, when you spread dirt, it has a nasty way of always having a little bit stick.