LONDON - JULY 10: (FILE PHOTO) In this photo illustration a lap top is logged onto the social networking site Facebook on July 10, 2007 in London, England. Social networking site 'Facebook' reaches it's 5th birthday this month. It was founded in 2004 by Mark Zuckerberg from his dorm room at Harvard University with the aim to help students keep in touch over the internet. Within 24 hours 1,200 Harvard students had signed up. The site now has 150 million active users worldwide. Getty Images logo Getty Images 28 months ago

LONDON - JULY 10: (FILE PHOTO) In this photo illustration a lap top is logged onto the social networking site Facebook on July 10, 2007 in London, England. Social networking site 'Facebook' reaches it's 5th birthday this month. It was founded in 2004 by Mark Zuckerberg from his dorm room at Harvard University with the aim to help students keep in touch over the internet. Within 24 hours 1,200 Harvard students had signed up. The site now has 150 million active users worldwide.

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  1. In this photo released by Harvard University, Professor of Genetics Jack W. Szostak is seen in his home in Boston Monday, Oct. 5, 2009 after learning he won a share of the 2009 Nobel Prize in medicine.
  2. In this photo released by Harvard University, Professor of Genetics Jack W. Szostak is seen in his home in Boston Monday, Oct. 5, 2009 after learning he won a share of the 2009 Nobel Prize in medicine.
  3. Drew Faust, President of Harvard University, sits for an interview at the Newseum in Washington, October 2, 2009. The interview was part of the First Draft of History event, held by the Atlantic Magazine and the Aspen Institute to bring together newsmakers, historians and journalists.
  4. Captain Agus Harimurti, Harvard University student and son of Indonesian President Susilo Bambang Yudhoyono, waves after being introduced at the beginning of his father's speech at the John F. Kennedy School of Government at Harvard University in Cambridge, Massachusetts September 29, 2009.
  5. In this book cover released by Harvard University Press, "A Failure Of Capitalism: The Crisis of '08 and the Descent into Depression," by Richard Posner, is shown.
  6. Retired Harvard librarian Sylvia McDowell stands by the gravestone for John Jay Smith at the Forest Hill Cemetery in Boston, Friday Sept. 11, 2009. Smith's marker was rediscovered as part of a project to research well-known African Americans who have been overlooked or forgotten at the cemetery.
  7. In this photo released by American Lung Association, a sheet of new Christmas Seals is shown in New York, Thursday, Nov. 19, 2009. Emily Bissell, started selling Seals in 1907 to help fight the battle against tuberculosis with a design she created. The American Lung Association is helping fight lung disease and advocate for clean air. It has also launched e-cards in an appeal to younger audiences depicting it's entire archive of designs and offers a Facebook application as well.
  8. In this photo released by American Lung Association, actress Mary Duffy portrays Emily Bissell, founder of the Christmas Seals campaign, as she hands out samples Christmas Seals to mail carrier Steve Revell in front of the James A. Farley Post Office in New York, Thursday, Nov. 19, 2009. Helping to fight lung disease and advocate for clean air, the American Lung Association has launched e-cards and a Facebook application in an appeal to younger audiences depicting it's entire archive of designs as far back as 1907.
  9. In this photo released by American Lung Association, actress Mary Duffy, portrays Emily Bissell, founder of the Christmas Seals campaign, as she hands out samples of Christmas Seals in front of the James A. Farley Post Office in New York, Thursday, Nov. 19, 2009. Helping to fight lung disease and advocate for clean air, the American Lung Association has also launched e-cards and a Facebook application in an appeal to younger audiences depicting it's entire archive of designs as far back as 1907.
  10. Marketing Director of Facebook Randi Zuckerberg speaks during the Youth Engagement Summit 2009 in Putrajaya outside Kuala Lumpur November 17, 2009.
  11. Marketing director of Facebook Randi Zuckerberg speaks during the Youth Engagement Summit 2009 in Putrajaya outside Kuala Lumpur November 17, 2009.
  12. View of the Oxford American College dictionary taken in Washington on November 16, 2009. The New Oxford American Dictionary named 'unfriend' -- as in deleting someone as a friend on a social network such as Facebook -- its word of the year on Monday. Oxford University Press USA, in a blog post, said 'unfriend,' a verb, had bested netbook, sexting, paywall, birther and death panel for the honor.'Unfriend has real lex-appeal,' said Christine Lindberg, senior lexicographer for Oxford�s US dictionary program.

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  11. Serbia's Novak Djokovic, right, swaps shirts with Russia's Nikolay Davydenko, left, after their ATP World Tour Finals tennis match at the O2 Arena in London, Monday Nov. 23, 2009.
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