Tripl is a travel social networking site and offers either a universal iPhone app or a desktop site.

Tripl - iPhone Travel Apps and Social Networking Site

Tripl let you to compile a neat summary of what you do while you’re traveling. Tripl connect to your Facebook, Foursquare or Instagram accounts to keep you informed of where your friends are traveling through beautiful interactive stories complete with pictures, check-ins, and additional content about the destination.

The desktop site even offers to find your friends who are near where other friends are traveling, along with links to Wikipedia’s information about the area and place to buy tickets to take a trip of your own.

Visit Tripl website »
Tripl is free in the iPhone App Store »