Yelp was founded in 2004 to help people find great local businesses like dentists, hair stylists and mechanics. Yelp had an average of approximately 139 million monthly unique visitors in Q3 2014. Yelpers have written over 67 million local reviews. In addition to reviews, you can use Yelp to find events, lists and to talk with other Yelpers. Every business owner (or manager) can setup a free account to post photos and message their customers.