This is going back a few pages, but I wanted to say that while I understand the impulse to want to protect members of the community (and I've sent a few "I think she's a troll" PM's myself when I've seen someone seemingly over-drawn into a drama, as suggested by a mod), I do think we each have a responsibility ourselves not to get sucked in - this is, afterall, an anonymous internet board at the end of the day.
If you havent met the person in real life, done some googling on their blog/email/etc., known them for a very long time, you really shouldnt be donating money you're not willing to lose, or investing emotionally to an extent that it will sour your time on the forum, imo. As the saying goes - "On the internet, nobody knows you're a dog."
I think a few well-phrased "OP, you said this on Y date, and that on X date - can you clarify?", a report to the mods, and some thoughtful PMs are all really great tools to deal with the not-so-obvious trolls.