In industries that rely on human capital, such as technology and media, companies compete for talent via M&A. The "acqui-hiring" trend is especially apparent at Yahoo Inc. (Nasdaq: YHOO), which has conducted more than a dozen transactions over the last year or so.

Tumblr Inc. ranks as Yahoo's fourth-biggest acquisition and the biggest deal the company has made under Marissa Mayer since she left Google to become CEO of Yahoo in July 2012. Yahoo closed the $1.1 billion purchase of the New York blogging service in June 2013, gained Tumblr founder David Karp (pictured), who, at 27 years old, is considered a rising star in in the tech world.

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