This code is so old, essentially from the Windows Phone 7.0 release, that you should run away!
4th & Mayor is a Windows Phone application for using foursquare.
The modern, current implementation of 4th & Mayor is not based on any of this source code (unfortunately). I'm looking for ways to publish the modern implementation in the future with an appropriate license. Thanks.
At this time, the repo contains a subset of the application source.