Twitter founder Biz Stone listens as San Francisco Mayor Gavin Newsom speaks during a news conference in San Francisco, California June 1, 2009. Newsom announced a civic collaboration between the social networking service and the city's 311 customer service center, where citizens can now alert officials to issues by using Twitter. Reuters Pictures logo Reuters Pictures 33 months ago

Twitter founder Biz Stone listens as San Francisco Mayor Gavin Newsom speaks during a news conference in San Francisco, California June 1, 2009. Newsom announced a civic collaboration between the social networking service and the city's 311 customer service center, where citizens can now alert officials to issues by using Twitter.

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  2. Actor Samuel L. Jackson (facing the camera) presents George Lucas with the Vanguard Award during the 43rd Annual NAACP Image Awards at the Shrine auditorium in Los Angeles, California February 17, 2012.
  3. Los Angeles Mayor Antonio Villaraigosa (R) claps in celebration of the Lakers making a three-point shot with California Governor Jerry Brown and Chinese Vice President Xi Jinping (L) as they watch the Phoenix Suns and Lakers NBA basketball game in Los Angeles, California February 17, 2012. Vice President Xi, China's leader-in-waiting to President Hu Jintao, is wrapping up a five-day visit to the United States with a two days of business talks Los Angeles.
  4. PERTH, AUSTRALIA - FEBRUARY 18: Brad Haddin of the Blues looks on as the ball heads to the boundary during day two of the Sheffield Shield match between the Western Australia Warriors and the New South Wales Blues at WACA on February 18, 2012 in Perth, Australia.
  5. PERTH, AUSTRALIA - FEBRUARY 18: Brad Haddin of the Blues walks to the players pavillion at the lunch break during day two of the Sheffield Shield match between the Western Australia Warriors and the New South Wales Blues at WACA on February 18, 2012 in Perth, Australia.
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  8. Cars drive past presidential campaign posters for Russian billionaire Mikhail Prokhorov (top) and Communist leader Gennady Zyuganov in Moscow February 17, 2012. The upcoming Russian presidential elections are scheduled for March 4. The boards read: "Mikhail Prokhorov. New President - New Russia" and "March 4. Electing Zyuganov". Picture taken February 17, 2012.
  9. Ai Miyazato of Japan walks on the fairway during the third round of the Golf Honda LPGA Thailand 2012 in Pattaya on February 18, 2012.
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  11. Los Angeles Lakers guard Kobe Bryant, right, puts up a shot as Phoenix Suns center Channing Frye during the second half of their NBA basketball game, Friday, Feb. 17, 2012, in Los Angeles. The Lakers won 111-99.
  12. Chinese Vice President Xi Jinping, left, sits with Calif. Gov. Jerry Brown, center, and Los Angeles Mayor Antonio Villaraigosa as they watch the Los Angeles Lakers play the Phoenix Suns, Friday, Feb. 17, 2012, in Los Angeles. Xi is set to lead China for the coming decade, succeeding President Hu Jintao as Communist Party leader later this year, then becoming president in 2013.
  13. In this Friday, Feb. 17, 2012 photo, well-wishers visit the Imperial Palace in Tokyo to send get-well messages to Japanese Emperor Akihito on a special notebook. Akihito was undergoing heart-bypass surgery Saturday intended to allow him to lead a healthier, more active life. Akihito, 78, entered the operating room Saturday morning as scheduled, and the surgery was expected to last about five hours, the Imperial Household Agency said.
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  15. EDS NOTE NUDITY - A dancer performs during the parade of Vai-Vai samba school in Sao Paulo, Brazil, Saturday, Feb. 18, 2012.
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