To use the feature, you first have to connect your Twitter and Amazon accounts, which you can do through your social settings. Then, all you have to do is reply with #AmazonBasket to any tweet that contains an Amazon product link, and it will be added to your shopping basket. With one eye on localization, the service is actually called #AmazonCart for US shoppers, which makes sense. The feature only appears to be live in the US and the UK for now, however.