TripAdvisor users have booking access to rooms at more than 4,000 Best Western hotels in more than 100 countries, Best Western said in a statement Tuesday. The feature is available on both TripAdvisor's desktop and mobile sites. TripAdvisor, the world's largest travel review site, is looking to diversify its revenue sources by increasing the number of travel bookings through its website. The company, which was spun off by online travel agency Expedia in late 2011, went live with its Instant Booking feature in June with inventory from Choice Hotels International, hotel-booking site GetaRoom.com and TripAdvisor's discount hotel-booking online travel agency, Tingo. The following month, TripAdvisor added hotel inventory from GDS operator Travelport to the Instant Booking feature, giving users booking access to Travelport's listings for 580,000 hotels worldwide, including 480,000 nonbranded properties. Source: Travel Weekly