From Grad Student to Social Media MillionaireHow twentysomething Shama Kabani of Marketing Zen Group wrote a master's thesis on Twitter and then went on to build a leading-edge marketing firm. Part of our annual Young Millionaires report.

Skeptics saysocial mediahasn't existed long enough to produce experts. Clearly, those folks haven't met Shama Kabani. The 26-year-old wrote her master's thesis for the University of Texas at Austin about Twitter--when it had only 2,000 users, not the 175 million it has today. She hosts a web TV show about technology. Her 2010 book,The Zen of Social Media Marketing: An Easier Way to Build Credibility, Generate Buzz and Increase Revenue, is the No. 4 seller about web marketing on Amazon.com.

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