California dentist Yvonne Wong has sued two parents who complained in a review on Yelp that their child received mercury fillings and left Wong’s office feeling light-headed from laughing gas. Wong claims “it never occurred to her to contact the boy’s parents” before filing her libel suit, although the dentist clearly doesn’t have the best counsel. Her lawyer also tried to sue Yelp, apparently unaware that web sites publishing third-party content are protected under federal law.