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Shop inside a tweet with Twitter's 'Buy' button

Twitter takes your credit card as it expands into commerce, Facebook and Spotify put focus on video ads, and TiVo launches a DVR to record three years' worth of video.

Another social network wants your credit card information. In this CNET Update, learn about Twitter's new "Buy" button that folds shopping into the mobile app. Meanwhile, other services are determined to show you more video ads:

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Shop inside a tweet with Twitter's 'Buy' button