Check out the American Express Twitter promotion. American Express is offering special deals on dining and travel for those that retweet Amex special offers. It’s simple to signup. All you need is a Twitter account, go to the registration page to sync your American Express card, retweet the offer on Twitter and get a credit on your card for the special offer. Recent specials include a $375 credit at Four Seasons Hotels to $5 off your next purchase at McDonalds. Offers are pretty wide ranging, so sync your card up today and get tweeting. We did.