The Twitter page for al-Shabab, the radical Islamic group in Somalia that has been branded a terrorist organization by the U.S. Such groups are active in social media, but have not attracted many recruits. hide caption

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This image, released by the North Korean Central News Agency, was taken within seconds of the one above. An analysis shows that it was digitally altered, removing the cluster of men on the left edge and enhancing the perfect line of mourners. KCNA/EPA /Landov hide caption

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LinkedIn founder Reid Hoffman watches as his company is listed on the New York Stock Exchange in May. Despite the global economic uncertainty, tech companies held steady on Wall Street. Mark Lennihan/AP hide caption

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At Pace University in New York, college students who tutor seniors in local retirement homes are prepped with sensitivity training. Brittany Beckett (left), a Pace student, and Muriel Cohen work together at United Hebrew of New Rochelle. Courtesy of Pace University hide caption

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While many think of the tablet computer as a new idea, the concept can traced back to the original Star Trek series and Arthur C. Clarke's 1968 novel 2001: A Space Odyssey. Noel Celis/AFP/Getty Images hide caption

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Models hold the new Samsung Galaxy Nexus Android phone during its official launch in Hong Kong in October. The new smartphone runs Google's Android "Ice Cream Sandwich" operating system. Laurent Fievet/AFP/Getty Images hide caption

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Workers dig at a mine in Chudja, near Bunia, north eastern Congo. The conflict in the Congo, a nation rich in mineral resources such as gold, diamonds, tin, and cobalt, has often been linked to a struggle for control over its minerals resources. Lionel Healing /AFP/Getty Images hide caption

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