Here's how it works: Buy any burger at Fridays and enter the code on the receipt at www.jumpburger.com. Once entered, you'll get a free burger to broadcast either on Facebook, Twitter or via email to friends. The first person to click on your link will score themselves a free burger on their next visit to TGI Fridays.
Apparently, according to the TGI Fridays Facebook page, if you order two burgers on the same check, you'll still get two codes to redeem.
They're calling it the "Jump Burger" promo, which they liken to a jump ball in basketball (where two players jump for a ball that the referee throws in the air) except with a digital burger (code).
The "Jump Burger" deal is good through August 23, 2015.