Mark Zuckerberg: Founder and CEO of Facebook
Why We Picked Him: He had built a stunningly popular product that was changing the way people communicate.
Report Card: Facebook has, of course, continued to extend its reach on the Web, passing 500 million users in July. The company has integrated Facebook for use with other websites, spreading "Like" and "Recommend" buttons across Pandora, CNN, and over 100,000 other sites--including this one. However, Zuckerberg's company continues to demonstrate that "popular" and "liked" aren't the same thing: the 2010 American Customer Satisfaction Index found that Facebook's customer satisfaction ranked with that of airlines and cable companies, below even IRS e-filing.