40 Under 40: The Twitterati

These movers and shakers are leveraging the power of social media to influence thousands, if not millions, of followers in real-time.

Marissa Mayer
Marissa Mayer

President and CEO, Yahoo
40 Under 40 rank: 3
Twitter user name: @marissamayer
Number of followers (as of Oct. 9, 2012): 231,886

Our favorite tweet: Just realized today is my "reciprocal anniversary" - ?@ZackBogue and I got married on 12.12.09 and today is 09.12.12 :)

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The list

They're the hottest young stars in business across the globe. They're innovators, disrupters, and job creators; in fact, it's a pretty safe bet you're going to be working for them someday -- if you aren't already!