The Lonely Planet Thorn Tree Forum is the name given to the official forums of the Lonely Planet website. It's a community of travel enthusiasts who get together and share their travel stories.
The Lonely Planet is a website and travel guide publisher dedicated to all forms of travel, from adventure to leisure. As such, The Thorn Tree Forum is intended for people to learn about other destinations they might not have heard of, and it's also a place where travellers can learn about some of the best hidden features of a city. The forum boasts that it covers every place on the planet, even those that don't have travel guides.