From Amex Open Forum:
“At the point and time that [the merchants] refused to continue to pay for advertising the good reviews were stripped,” said attorney Larry Murray, who represents the business owners, according to Entrepreneur.com. “There seems to be a one-to-one correlation between money and having a good rating and it has nothing to do with the truth.”…
Tracy Chan, a San Francisco dentist and one of the plaintiffs, claimed that Yelp took down nine of her five-star customer reviews after she declined to buy an ad on the site.
via Yelp Back in Court Over Extortion Claims | The New OPEN Forum.