Hinge is a dating app that introduces you to people that are friends with your friends. You will have to use your Facebook account when registering as this is how they introduce you to friends of friends. They also use your photos, work and education history as well as your likes as a way to introduce you to a possible match.
The app is currently only available in 9 cities DC, Philadelphia, NYC, Boston, San Francisco, Chicago, Atlanta, Dallas, and L.A with more cities to add in the future.
The really nice part about Hinge is that you don't have to worry about fake profiles or "rando's" as the site calls them. You know that each person is legitimate as they are friends of friends.