23. Clara Shih
40u40 main clara shih
Age: 30

Co-founder and CEO, Hearsay Social

Shih's impressive resume -- she developed Facebook's first business application in 2007, and in 2009 published The Facebook Era (the de facto social networking handbook for corporations) -- led her to launch Hearsay Social with her college friend and former Microsoft exec Steve Garrity in 2009, backed by $21 million in funding. The fast-growing platform helps large companies actively manage their social media presence across multiple sites. Equally notable is Shih's clout beyond the office. After stints working at Google and Salesforce, she counts Facebook COO Sheryl Sandberg and Salesforce.com CEO Marc Benioff as her mentors. Last December, Shih was named to the Starbucks board of directors, where she rubs shoulders with the company's CEO, Howard Schultz; Juniper Networks CEO Kevin Johnson; and Ariel Investments president Mellody Hobson.

Best advice: Underpromise, overdeliver.

--C.L.


  @FortuneMagazine - Last updated October 17 2012 05:11 PM ET
Join the Conversation
The job creators

Organizations headed by some of these top young minds in business have grown this past year, many of them hiring at an impressive rate. Here are seven examples.

Market indexes are shown in real time, except for the DJIA, which is delayed by two minutes. All times are ET. Disclaimer LIBOR Warning: Neither BBA Enterprises Limited, nor the BBA LIBOR Contributor Banks, nor Reuters, can be held liable for any irregularity or inaccuracy of BBA LIBOR. Disclaimer. Morningstar: © 2014 Morningstar, Inc. All Rights Reserved. Disclaimer The Dow Jones IndexesSM are proprietary to and distributed by Dow Jones & Company, Inc. and have been licensed for use. All content of the Dow Jones IndexesSM © 2014 is proprietary to Dow Jones & Company, Inc. Chicago Mercantile Association. The market data is the property of Chicago Mercantile Exchange Inc. and its licensors. All rights reserved. FactSet Research Systems Inc. 2014. All rights reserved. Most stock quote data provided by BATS.