According to an Amex Web page, the arrangement works like this. Amex cardholders first sync their card with Twitter. Then, when they come across products that are eligible to purchase under the plan — products that American Express will promote through a Twitter feed — they simply send out a tweet that includes a special hashtag. Amex will then send them an @-reply with a confirming hashtag. Finally, the buyer has to send out a second tweet with the special hashtag within 15 minutes.
I’m going to “synch” my credit card with my twitter account?
And I’m going to wait for them to send me tweets?
And then I’m going to tweet them back when I want to buy something?
Why would I want to do this?