Facebook Headquarters

PALO ALTO, CA - MARCH 31: Young employees gather in the meeting room at the Facebook headquarters to learn about 401K pension plans, and every Friday to hear updates and ask questions with CEO and President Mark Zuckerberg, in Palo Alto, March 31, 2009. Founded in 2004, Facebook is the 10th most visited web site in the world, with some 175 million users who communicate in forty languagues. A private company run by co-founder, CEO and President Mark Zuckerberg, twenty five, Facebook won't divulge its earnings, but it employs 800 people and, like many Silicon Valley companies, provides them with free onsite amenities such as laudry service and restaurants, and a relaxed work environment. (Photo Gilles Mingasson/Getty Images)