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Buys Tumblr for $1.1 billion

Mayer's biggest move in her first year came in May when Yahoo doled out $1.1 billion to buy Tumblr, a popular social network. The acquisition was a way to give Yahoo access to a younger audience. Mayer also committed to not "screw up" the social network by leaving its founder David Karp in... Emmanuel Dunand / AFP/Getty Images