Another SXSW finalist, this time in the Social Media Interactive category, Stamped is a free iOS app that lets you ’stamp’ your favorite things, including restaurants, books, movies, and music, to share them with friends.

The unique spin on Stamped is that your recommendations are only shared with people you know, and vice versa. "No noise, no strangers, just the people you trust and the things they love," the app web site boasts.

You can even organize all the stamps you’re eyeing via a To-Do list, view a map of all your friends’ stamps to see if anything is nearby and, of course, share your stamps on Facebook and Twitter.