Mark Zuckerberg

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Facebook website founder Mark Zuckerberg rides a water buffalo in the northern resort town of Sapa in Vietnam where he vacationed last week. (VnExpress via Associated Press)

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In this Dec. 26, 2011, photo, Facebook website founder Mark Zuckerberg rides a water buffalo in northern resort town of Sapa in Lao Cai province, Vietnam. (AP Photo/VnExpress, Le Thanh Hieu)

** FILE ** In this April 20, 2011, file photo, President Barack Obama, accompanied by Facebook CEO Mark Zuckerberg, speaks during a town hall meeting to discuss reducing the national debt at Facebook headquarters in Palo Alto, Calif. (AP Photo/Pablo Martinez Monsivais)

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Facebook chief Mark Zuckerberg talks about Timeline at a developers conference Sept. 22 in San Francisco. Users can share their choices of music, movies, games and news sources with their friends as part of what the Facebook website describes as a new way to "tell your life story with a new kind of profile." (Associated Press)

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This screenshot made on Friday, Feb. 4, 2011 shows Dr. Edward Zuckerberg's Facebook page. Dr. Edward Zuckerberg, father of Facebook CEO Mark Zuckerberg, said in a radio interview Friday that Mark's early exposure to computers helped inspire his interest and expertise in technology. Dr. Zuckerberg also said he uses Facebook to promote his dental practice and spends about an hour a day on the site. He also still does Mark's "routine dental care." (AP Photo/Facebook) NO SALES; EDITORIAL USE ONLY

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FILE - In this May, 26, 2010 file photo, Facebook CEO Mark Zuckerberg talks about the social network site's new privacy settings in Palo Alto, Calif.(AP Photo/Marcio Jose Sanchez, file)

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FILE - In this May, 26, 2010 file photo, Facebook CEO Mark Zuckerberg talks about the social network site's new privacy settings in Palo Alto, Calif.(AP Photo/Marcio Jose Sanchez, file)

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** FILE ** Facebook founder Mark Zuckerberg (AP Photo/Jeff Chiu, File)

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The Apollo 8 astronauts, Jeff Bezos, Mark Zuckerberg and Bill Gates, Melinda Gates and Bono were all honored by Time magazine

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FILE - In this Nov. 16, 2010 file photo, Facebook CEO Mark Zuckerberg smiles as he speaks at the Web 2.0 Summit in San Francisco. Zuckerberg has been named Time magazine's "Person of the Year" for 2010. (AP Photo/Paul Sakuma, File)

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ASSOCIATED PRESS Mark Zuckerberg, co-founder and CEO of Facebook," called the Time selection "a real honor." He's the youngest choice for the honor since the first one chosen, Charles Lindbergh in 1927.

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Time Magazine named Facebook founder and CEO Mark Zuckerberg its 2010 "Person of the Year" on Wednesday, Dec. 15, 2010. (AP Photo/Time Magazine)

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FILE - In this Nov. 15, 2010 file photo shows Facebook CEO Mark Zuckerberg smiling at an announcement in San Francisco. Another 17 of America's richest people, including Zuckerberg, junk bond pioneer Michael Milken and AOL co-founder Steve Case, have pledged to give away most of their wealth. They are the latest to join the Giving Pledge, an effort led by Microsoft founder Bill Gates and investor Warren Buffett to commit the country's wealthiest people to step up their charitable donations. (AP Photo/Paul Sakuma, file)

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FILE - In this Nov. 16, 2010 file photo, Facebook CEO Mark Zuckerberg smiles as he speaks at the Web 2.0 Summit in San Francisco. (AP Photo/Paul Sakuma, file)

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Mark Zuckerberg (right), Facebook founder, says he was inspired to give $100 million to the Newark, N.J., public schools system by the mayor. (Associated Press)

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FILE In this Wednesday, Oct. 17, 2007 photograph, Facebook founder Mark Zuckerberg smiles during a talk at Web 2.0 conference in San Francisco. Several media outlets reported Wednesday, Sept. 22, 2010, that Zuckerberg is going to donate $100 million to Newak's public school system, which has has some of state's lowest test scores and poorest graduation rates. On Oprah Winfrey's Chicago-based syndicated television show Friday, Sept. 24, 2010, Democratic Newark Mayor Cory Booker, Republican Gov. Chris Christie and Facebook founder Zuckerberg are expected to announce the donation. (AP Photo/Paul Sakuma,file)

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Facebook CEO Mark Zuckerberg, right, talks with employees before announcing the social network site's new localization services called "Places" during a press conference in Palo Alto, Calif., on Wednesday, Aug. 18, 2010. (AP Photo/Tony Avelar)