Might want to think twice next time you review anything online, period. If you have to and it’s a negative one - create a FAKE account (hello McFly!?)
San Franciscan Christopher Norberg went to a chiropractor after being injured in a car accident in 2006. After a disagreement with the chiropractor over billing, he posted a negative review of the business on Yelp suggesting that the doctor was dishonest. Now he is facing a defamation lawsuit that could chill self-expression on the popular gripe Web site. CNET News reports it here.
Source: CNET News

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This guy wont win - he was just expressing his opinions. I’ve heard of 3 other cases attacking yelp and its users the same way.