Yahoo is acquiring popular social media blogging site Tumblr for $1.1 billion, the company announced Monday. Take a look at other notable online startup acquisitions.
Twitter acquired Tweetdeck, a popular third-party Twitter application, in May 2011 for $40 million. Twitter has a history of acquiring third-party applications -- they did the same thing with iPhone app Tweetie in 2011, according to CNN.
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