On Saturday, April 16, global fans of the growing social network will celebrate Foursquare Day by checking in via mobile device at their favorite locations.

On Saturday, April 16, global fans of the growing social network will celebrate Foursquare Day by checking in via mobile device at their favorite locations.

Columbus businesses will vie to accumulate check-ins during the event. The Little Bar, for example, is planning special promotions and a ribbon-cutting ceremony with its Foursquare "mayor."

Check meetup.com/foursquare for other activities.