Twitter is already allowing users to make buys while simultaneously sharing your thoughts on any trending topic. In the U.K., Twitter users that also have Amazon accounts can add products to their Amazon cart by tweeting with #AmazonCart or #AmazonBasket as a reply when someone they follow tweets a link to a product sold on Amazon.
The "Buy Button" could be another experiment, which we should wait to see whether it will make it past the development stage.
Twitter has also acquired Tap Commerce, a marketing firm specializing in redirecting users to mobile apps.
Ebay, Fab, and Hotels.com are includied on the list of Tap Commerce's clients.