TripAdvisor's new Facebook integration makes it easy to find friends' reviews and learn from their experiences in the same locale. Zoom into any area of the map on TripAdvisor, and pushpins show you where your Facebook pals (who've used the "Where I've Been Facebook" app) have traveled. It's a simple matter to click on one of those pushpins and see friends' reviews of that destination.
It's not surprising that TripAdvisor would team up with Facebook in this way, given that the company bought the "Where I've Been" Facebook app in 2007 for $3 million. It seemed like a high price at the time, but maybe now that investment is coming into fruition.
UPDATE: Ultimately, TripAdvisor did not acquire the "Where I've Been" app in 2007. According to a TripAdvisor spokesperson who contacted us, "TripAdvisor utilizes Facebook's 'Cities I've Visited' application, which launched in 2007, for the new Facebook integration and social map feature."