Based on the bits and pieces on this thread I would assume it is the <removed due to assumption error>.

I use Trip Advisor to check out all of the hotels I book at if it isn't a hotel that I've stayed at previously. I throw out the ones that are obviously written by the hotel (using the language straight from the hotel website) and the ones by customers that had unrealistic expectations and then have a go.

I especially like Trip Advisor when I'm headed to a city I've never been to before.

Anywho, although this is not to be taken as legal advice, and this does not in any way establish a attorney/client relationship. If you need legal advice it is best to consult a lawyer in your state and that is well versed in this area of the law but generally (and in my state)as long as you speak the truth, you haven't committed libel/slander/defamation. So as long as the Trip Advisor members' posted truthfully I wouldn't think they'd have much to worry about from the heavy handed response.