A bigger facial recognition database could allow Facebook to collect more data about whom we are interacting with in the real world. Dado Ruvic/Reuters/Landov hide caption

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On June 15, the day that Pandora became a publicly traded company, traders on the floor of the New York Stock Exchange wore the company's insignia. Spencer Platt/Getty Images hide caption

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A zoo in central China's Henan province swapped a dog — a Tibetan mastiff like the one shown here — for a lion, in another story that recently swept Chinese cyberspace. Ed Jones/AFP/Getty Images hide caption

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More than 200,000 gather on the Washington Monument grounds before marching to the Lincoln Memorial on Aug. 28, 1963. AP hide caption

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