In a partnership between Amazon and Twitter, users of both get a unique—albeit fairly specific—ability: If you spot an Amazon product link on Twitter, you can now add it to your shopping cart just by responding to the tweet with the hashtag #AmazonCart. In order for this to work, of course, you have to connect your Amazon account to your Twitter account—which you can do at amazon.com/AmazonCart. Once you’ve replied to a link, the item will appear in your cart the next time you visit Amazon’s site. You’ll also be notified via email and in a reply tweet from @MyAmazon that a product has made its way into your cart. If you don’t yet have your Twitter and Amazon accounts linked and you send an #AmazonCart tweet, you’ll get a reply from Amazon asking you to set up the service. At first, the social shopping cart will only be available to those in the U.S. and in the U.K.—where the hashtag will be #AmazonBasket.