From Foursquare's BlackBerry Engineer, Kyle:
"Yesterday, BlackBerry announced their first BB10 devices. We here on the BlackBerry team at Foursquare are really excited about the launch and wanted to give our awesome third party developers something to help them get the most out of Foursquare and BlackBerry 10. With the help of the amazing Invocation Framework (learn more here) we have opened up a few parts of the Foursquare for BlackBerry 10 app to developers to enrich their native apps with Foursquare content easier than ever before. Check out the two examples below and then head over to GitHub to check out our sample app and get started."