Tweet to save with your American Express credit card

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If you have an American Express credit card and you're looking for deals, you now have a new way to get them. Just tweet about them first.

American Express has launched a service that lets cardholders earn special offers from merchants after linking their AmEx card to Twitter, then tweeting customized hashtags from their Twitter handle.

The offers will be delivered automatically via a statement credit within days of making the specified purchase online or in the store. Cardholders can find the offers and their accompanying hashtags highlighted as "favorites" on the AmEx Twitter page.

The merchants are major names, from Best Buy to Whole Foods, and the deals look pretty good.

For instance, you can get $5 back when buying $5 or more of fast food at McDonald’s if you tweet #AmexMcDonalds before March 31. On the other side of the food spectrum, Whole Foods will give you a $20 credit the next time you buy $75 or more in groceries if you tweet #AmexWholefoods between now and April 30.

AmEx says it will confirm that offers have gone through via @amexsync, an automated notification handle. Once you use the hashtag, you’ll receive a response letting you know your offer has been activated.

So, if you tweeted the Whole Foods hashtag while shopping there, you could redeem the offer in the same visit by simply swiping your AmEx credit card at the register. The credit will show up on your statement a couple of days later.

The @amexsync handle will also let you know if you are tweeting a hashtag for a deal that is no longer being offered or if you’re tweeting hashtags without having a synced AmEx card. Any questions regarding the service should go to @askamex, the issuer’s customer service handle.

If you’re willing to tweet for savings -- and you don’t mind being a corporate shill for your credit card -- then you’ll score some good deals.

If you’re concerned about privacy, AmEx says it does not share any of your personal information with Twitter, but it will provide merchants with general information about the overall response to the offer and the average amount cardholders spent to score the deal.