9. Marissa Mayer

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The new Yahoo CEO has survived her first year on the job -- and she's making her mark by going on a shopping spree.

Yahoo (YHOO) spent $1.1 billion on blogging site Tumblr (promising "not to screw it up), and picked up former news anchor Katie Couric as well as New York Times tech writer David Pogue.

Related: How one year of Mayer changed Yahoo

December 23 2013 08:27 AM ET