A mysterious buy now button has started appearing in tweets received via the Twitter smartphone app Twitter is known for conducting experiments and testing the water with new ideas, many of which never make it past the development stage and it is also equally known for quickly pulling features if they dont chime with users such as direct messaging. In the US and UK, Twitter users that also have Amazon accounts can add products to their Amazon cart by tweeting with #AmazonCart or #AmazonBasket in the UK as a reply when someone they follow tweets a link to a product sold on Amazon.