It's FourSquare Day!

My FourSquare Badges

Foursquare is a location-based social networking service for mobile devices. Users "check in" at venues from a device by selecting a nearby venue from a list located by GPS and/or network location. Each check-in awards the user points, and unlocks specials if offered by the venue. Badges are earned by checking in to certain venues or by completing certain tasks.

Foursquare declared April 16 "Foursquare Day" as April being the 4th month and the 16th being equal to four squared (4²).

My postcard US-2139832 sent to Germany on March 19, 2013 shows all the FourSquare badges I earned by then.