Yelp, founded in 2004, is a famous American business reviews site. It covers the merchants of the restaurant, shopping center, hotel and tourism business. And users can rate the merchants, submit comments, exchange the shopping experience in Yelp. Search for a restaurant or hotel in the Yelp, users can see its brief introduction and comments. Bring Yelp with you. With Yelp, you can write & read reviews anytime. With Yelp, you can get directions to anywhere. With Yelp, you can browse nearby and find interesting stuff. With Yelp, you can view menus and eat your favorite food. With Yelp, you can add and view photos around you. With Yelp, you can check-in and enjoy the day. In general, the comments are made by the people who has experienced the service themselves. Yelp is the largest review sites. Yelp started its business in San Francisco in 2004. Until now the current market value of Yelp has reached $6 billion. The slogan of Yelp is "real people real review".