Everyone's a critic at Yelp.com

CEO: 'Customer service is the new marketing'

Everyone’s a critic, or so the saying goes.

And that saying is the basis of the business model at Yelp.com, an online community that features user ratings and reviews on a wide range of businesses and professionals — including real estate brokerages and agents.

In July 2004, former PayPal pals Jeremy Stoppelman and Russel Simmons reunited to launch Yelp.com.