Yelp, the online review website, has taken on the role of private detective. With more than 71 million visitors monthly, Yelp is using a computer filter to help uncover companies that purchase fake positive reviews, calling out the offenders and then showing the world its...

Read more http://feeds.abcnews.com/click.phdo?i=4e9275a032f1f2cbfa60a06b432e59ad