Two years ago, PhocusWright studied the effect of Facebook recommendations on travel, and found that social has a much stronger impact on travel booking than we'd previously thought. As a result, niche travel sites, piggybacking on your Facebook, Twitter, and Foursquare friends' experiences, have cropped up online and via mobile apps. While they vary in their user interface and primary goal, all are intended to use the power of social recommendations to improve the quality of your travel.
Social-inspired travel is a big business, and these companies all have different takes on what makes for successful social trip planning.
GoGoBot allows you to plan a trip based on social recommendations. GoGoBot emphasizes the Q&A recommendation format more than other sites.
Gtrot helps you explore a city you're going to visit, from your social connections who live and travel there. Gtrot also allows you to plan a trip with friends and have your friends vote on your travel plans.
Wanderfly gives you travel recommendations based on tips from other users. This has a very clean interface that's a pleasure to explore.
TouristEye, like Wanderfly, GoGoBot and Gtrot, is a site and app that creates a custom tour guide for any destination.
TripBirds also provides social travel reviews, but with a fun user interface. It also allows you to see the places your social network has checked in to at your destination.
GotSaga is a social network for travelers.