25. Susan Wojcicki

Senior Vice President of Products and Commerce, Google; CEO, YouTube

When Google Maps and commerce boss Jeff Huber stepped down in March, longtime Google executive Susan Wojcicki took over commerce. At the same time, she was also running Google's ad business, overseeing Payments, Wallet, Offers, Shopping, Local Search, Maps & Earth, and Travel.

And, just this month, we got some more huge news about Wojcicki: She was tapped to become head of YouTube. By appointing Wojcicki as the new YouTube CEO, Google could be hinting that it's interested in revamping the video platform's advertising business.