We had news of a 25% off coupon that Gap was offering on Foursquare, Facebook, and Twitter a few days ago. Now for today only, you can purchase a $50 Gap Coupon for only $25 at Groupon.com. That’s a 50% discount, and you have to believe that Gap shoppers everywhere are taking advantage of it.

Groupon is a coupon group buying site. They set a limit for the minimum number of people that must purchase the offer. If that minimum is passed, then everyone who buys it will get the coupon. For the New York Groupon website, Gap set a limit of 800 people who had to take them up on the deal in order for it to become valid. As of 8:30 PM, they had 14,000+ members purchase the $50 coupon for $25.

Gap has suddenly become a social marketing master. They’ve been advertising deals on several popular social websites this past week, and apparently it’s working pretty well.

If you’re a gap shopper, you should take advantage of this incredible deal.