At the beginning
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Facebook and Mark Zuckerberg

Mark Zuckerberg, right, and friends work on, an early version of Facebook, in a rented home in Los Altos, Calif., in January 2005. Zuckerberg launched the social network in his Harvard dorm room in the previous year. It soon spread to more than 300 colleges and universities and grew to more than a million members. (Los Angeles Times)
Mark Zuckerberg, chief executive and founder of Facebook Inc., speaks at the social network’s F8 developers conference in San Francisco in September 2011. (David Paul Morris / Bloomberg)
Mark Zuckerberg greets a student as he arrives to speak during a news conference at Harvard University in November 2011. (Kelvin Ma / Bloomberg)
Mark Zuckerberg walks to morning sessions with his girlfriend, Priscilla Chan, during the Allen and Co. Sun Valley Conference in Sun Valley, Idaho, in July 2011. (Julie Jacobson / Associated Press)
Mark Zuckerberg, right, talks with Facebook employees before announcing the social network’s new location-based service called Places during a Palo Alto news conference in August 2010. (Tony Avelar / Associated Press)
Mark Zuckerberg, left, appears with host Jesse Eisenberg, center, on “Saturday Night Live” in January 2011. Eisenberg played Zuckerberg in the movie “The Social Network.” (Dana Edelson / NBC)
Mark Zuckerberg speaks at a news conference at Facebook headquarters in Palo Alto in July 2011. (David Paul Morris / Bloomberg)
Mark Zuckerberg, chief executive officer of Facebook Inc., center, Sheryl Sandberg, chief operating officer of Facebook, center left, and Robert Greifeld, chief executive officer of Nasdaq OMX Group Inc., center right, remotely ring the opening bell for trading at the Nasdaq MarketSite from the Facebook campus in Menlo Park, Calif. Facebook Inc. began trading Friday after a record initial public offering that made the social network more valuable than almost every company in the Standard & Poor’s 500 Index(Zef Nikolla / Facebook)