TripAdvisor, Inc. is an American travel website company providing reviews of travel-related content. It also includes interactive travel forums. TripAdvisor was an early adopter of user-generated content. The website services are free to users, who provide most of the content, and the website is supported by an advertising business model. TripAdvisor, headquartered in Needham, Massachusetts, claims to be the largest travel site in the world, with more than 60 million members and over 170 million reviews and opinions of hotels, restaurants, attractions and other travel-related businesses. TripAdvisor Media Group operates 25 travel brands including TripAdvisor, Airfarewatchdog, BookingBuddy, Cruise Critic, Family Vacation Critic, FlipKey, GateGuru, Holiday Lettings, Holiday Watchdog, Independent Traveler, Jetsetter, lafourchette, Niumba, OneTime, SeatGuru, SmarterTravel, Tingo, Travel Library, TravelPod, Viator, and VirtualTourist. TripAdvisor operates websites internationally, in such places as Austria, Australia, Brazil, Canada, China (under the brand ??? www.tripadvisor.cn), Denmark, France, Germany, Greece, India, Indonesia, Ireland, Italy, Japan, Mexico, The Netherlands,Norway, Poland, Portugal, Russia, Serbia, Singapore, Spain, Sweden, Thailand, Turkey, the U.K., and the U.S.