American Express has teamed up with Twitter to allow users to gain valuable discounts through selected retailers. Now, when users sync their cards by signing in through Twitter, they will be able to earn discounts by using the #AmEx hastag. Some popular stores using this marketing tool include McDonalds, Zappos, FedEx, H&M, Whole Foods, and Best Buy- just to name a few. This is an excellent idea, since tweeting is so simple to do. Customers will now be willing and eager to tweet their favorite stores to gain discounts.