http://tripadvisor.wordpress.com/2012/05/24/new-from-tripadvisor-city-guides-win-250-gift-card/
How to Enter: If you don’t already follow @TripAdvisor on Twitter, visit http://twitter.com/tripadvisor and click on the icon to follow @TripAdvisor. Once you are following @TripAdvisor, Retweet: “TripAdvisor launches #30NewCityGuides! Get your free app & RT for a chance to win a $250 Amex gift card. Details: http://tripadv.sr/JUtdFS”
Prize: One (1) winner will receive one (1) TripAdvisor swag pack, including a $250 Amex gift card, hat, notebook, luggage tag and grocery tote bag. The approximate retail value of the prize is $275.