The Gap brand may have just figured this social thing out. After the social brand debacle of the year, it is trying it's hand at location based social media. The Gap’s latest move has been to incorporate an “Add To Foursquare” button to its latest online campaign. Similar to a ‘like’ button for Facebook, this allows instant sharing to its customers’ friends, with the added benefit of adding a location. In return for the check-in the customer is given a 30% discount as a reward plus a $1 donation to charity.