TripAdvisor has introduced "TripAdvisor Trip Friends" feature, which allows users to get advice from their Facebook friends about planning their next vacation.

When researching a destination, hotel, attraction or restaurant on TripAdvisor, users who have logged in using Facebook will now see a list of friends who have been to that location, via TripAdvisor Cities I’ve Visited (CIV) application on Facebook.

Users will be able to directly message their friends, or post a message to group of friends, to get travel information. TripAdvisor says CIV has been one of the most popular applications on Facebook for almost three years, and it has more than five million monthly users.

"Facebook has always provided people with an easy way to connect with friends around the world, whether from Internet cafes or through sharing photos," said Ethan Beard, director of Facebook Developer Network.

"By integrating with Facebook, TripAdvisor is enhancing the exchange of trusted referrals, travel do’s and don’ts, and good stories from abroad, and making the travel experience more relevant and social to each person who interacts with the site."