Fontli(
http://www.fontli.com) is a social network for Typography enthusiasts to broadcast their passion through pictures taken from a mobile device. What makes Fontli different from other photo sharing applications is its typography centric features. Users can spot a typeface by simple photo tagging and Fontli gives additional information on the Typeface such as Designer/Foundry info and other pictures tagged with it.
Checkout the video
http://www.youtube.com/watch?v=xaMmNct0EjQ. Get the application here
Fontli | Windows Phone Apps+Games Store (United States)