(Reuters) - Twitter Inc is testing a "buy" button in some tweets that allows a mobile user to buy directly from a tweet. A small percentage of U.S. users will be able to see the "buy" button from Monday, Twitter wrote in a blog post. (http://bit.ly/1usnbBG) "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. (Reporting by Supantha Mukherjee in Bangalore; Editing by Saumyadeb Chakrabarty)



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