Negative online posts, even anonymous ones with questionable authenticity, can have a significant impact on a company’s sales figures, revenues, and bottom line. And now, at least according to one court, they can also be used as evidence of trademark infringement. In an article for InsideCounsel, Bromberg and Kung provide an analysis of how a Yelp review became the basis for the You Fit Inc. v. Pleasanton Fitness litigation and may even establish precedent.  The bottom line for companies:  monitor online business review sites and quickly correct any false and misleading statements about trademarks.