Haven't seen a thread made about this so thought I would share this with you guys. Alot of people from other forums taking advantage of this offer by making multiple facebook accounts to reuse the same card to re sync their cards after making a purchase (specifically the 100 Costco cash card) or syncing their authorized cardholders. I just bought a 100 Costco cash card and that qualified for my 25 cashback. This is actually a great deal Amex is offering and probably gonna buy 2 more from my authorized users but too lazy to make facebook accounts to get same offers.