Using the new hastag #AmazonCart feature.
If you are among the millions who buy games from Amazon, and you also happen to use Twitter a lot, then you will appreciate what the company is doing with the popular social networking website. Using the new hastag #AmazonCart feature, you can update your Amazon cart without actually leaving Twitter.
Just like with any third party service, Amazon requires you to connect your Twitter account to it. This way the service will know who added what in the cart. Another thing to note here is that your purchases will be public. That means unless you set your Twitter profile to private, others can see what you bought from Amazon.
Also, this service will only add games to the cart and not purchase them, so you are safe even if you accidentally used the hash tag. Along with the announcement of this new feature, Amazon also released a new video showing a man buying a copy of Watch_Dogs using Twitter.