Clothing retailer Old Navy thought of a creative way to reward its Facebook fans, who recently hit the 5 million mark. To do so, ad agency CP+B made the fans part of the celebration, having many of them hold up a giant coupon barcode in an aerial photograph.

To pull this off, CP+B brought together hundreds of people — many of whom are Facebook fans of Old Navy — holding colorful props to create a 120-foot-by-60-foot coupon. Everything in the coupon, including the barcode, the lettering and the Old Navy logo, is held up by a person. The barcode is made of 88 placards and is completely readable by in-store scanners. Fans can either print out the coupon or have a cashier scan the barcode from their smartphone for 30 percent off their total purchase.

Old Navy has been rising in the likes category recently. According to sister site PageData, the retailer had roughly 4.8 million likes Sept. 11, but it now boasts more than 5 million.

Want to see how it all came together? Check out this video:

Readers: Do you like Old Navy on Facebook?