Chairman and CEO of IAC/InterActiveCorp; Chairman, Expedia (IACI, EXPE)
Age: 65
The bombastic billionaire controls a vast swath of e-commerce, overseeing such megasites as Expedia.com, Citysearch, Ticketmaster, Match.com, and the youth-oriented CollegeHumor.com. He now plans to spend close to $100 million on a media campaign to promote IAC's Ask.com search engine, a competitor to Google and Yahoo. Age: 65
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