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Shares of Twitter Inc. (Nasdaq: TWTR) were up more than 2.5% on news the company was testing a "buy" button in some mobile tweets. The new icon enables users to purchase goods directly from a tweet. The company has begun testing the purchasing option with online partners such as Musictoday. The announcement was expected as Twitter is still chasing its rival Facebook, which released its own "buy" button on its site in July.