So far "Thank you's" have been pretty legit & we let em though, however I see on many other sites that "Thanks to XYZ" type posts are removed.
I'm guessing because some businesses see it as a great marketing opportunity, however they can turn bad when there is a disgruntled customer waiting in the wings waiting to snipe the business or "balance the feedback"

Foosh - thanks for your feedback, I've PM'd you.