Amazon has recruited the Twitter timeline for product checkout at their online stores. To get in on this, online shoppers just have to reply to a tweet which includes a link to any Amazon product of choice. Add #AmazonCart to your reply and the e-store magically adds the product to your checkout list on Amazon.com. The Amazon account should however be given access to your Twitter profile. @MyAmazon duly replies you with the outcome of your transaction. The service is bound to attract more business for Amazon as they harness the power of social media, while bringing in a new revenue stream to Twitter. Interested shoppers can sign up for the service here.