If you have a negative experience at a vacation spot, you might want to think twice before posting a negative review online. The link below talks about a Murfreesboro, TN man who posted a negative vacation condo review online and may be sued for $15,000. He says he had a crappy hotel experience; the owner denies his allegations and says it cost her a lot of business.
Truth is an absolute defense to defamation, but the internet is still considered the wild wild west when it comes to these kind of issues. First amendment advocates are afraid this will chill speech of those with valid complaints. There is sure to be litigation from both sides on these issues.