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Facebook Tests Buy Button as Twitter Acquires Startup CardSpring

Facebook Inc. and Twitter Inc. are getting closer to letting people shop as they chat and share posts with friends on social networks.

Facebook is testing a “buy” button on browsers and mobile devices that lets users make purchases through advertisements, the world’s largest social network said in blog post yesterday. Separately, Twitter said it acquired CardSpring Inc., a service that lets users redeem deals and discounts through merchants’ tweets.