You may soon start seeing a "buy" button in some of your tweets as Twitter increases its e-commerce efforts. A small percentage of U.S. users will be able to see the "buy" button from Monday, Twitter said.

"Users will get access to offers and merchandise they can't get anywhere else and can act on them right in the Twitter apps for Android and iOS," the company said.

The button will allow Twitter users to complete an entire purchase within Twitter apps for iOS and Andriod, while also giving brands a new way to make sales. Twitter said an entire purchase could be completed in just a few taps of the smartphone screen. The user will be prompted to enter shipping and payment information, which will be sent to the merchant for delivery.

The microblogging service company said it would add artists, brands and nonprofit organizations, such as Burberry, Eminem and Home Depot Inc, to the test.