Foursquare released a slick BlackBerry 10 app which they are working on adding more features to. One of the cool functionality enablers is the SDK that Foursquare has opened up to other developers on BlackBerry 10. This is the FIRST SDK that Foursquare has released and it opens up Foursquare to third party apps. The first feature they opened in single sign on which allows users to connect their Foursquare accounts with one click. That means you can now let a user login using their Foursquare account in 6 lines of code!!! They also opened up a place picker API that lets developers pull in data from foursquare for a location.