Do you have Foursquare on your smartphone, or are you a member of Facebook or Twitter? If so, you may just be in luck today if you like shopping at the Gap.

Gap has announced that for today only, if you checkin at any Gap store location with your Foursquare account, you will receive 25% off of your total order. If you don’t have Foursquare on your phone, no problem. Gap is also offering a coupon code to twitter users, as well as a printable coupon for Facebook fans.

Gap seems to be really trying to advertise their brand via social marketing. It should be very interesting to see how well this marketing campaign does.

This 25% off deal is only valid today for the “The BlackMagic Event”.