McDonald's Facebook page on July 27. Courtesy of McDonald's via Facebook hide caption

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Chinese moviegoers wear 3-D glasses as they watch Avatar in January 2010. AFP/Getty Images hide caption

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Security expert Markus Jakobsson says the best password could be as simple as combining words from a story that only you know. iStockphoto.com hide caption

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Hiroaki Aikawa and his son, Taiji, mourn the death of Hiroaki's wife, in Kevin Macdonald's Life in a Day, produced by Scott Free UK. Scott Free UK hide caption

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GOP presidential hopefuls use 140 characters or less to answer the question: "As president, how will you avoid continually raising the debt ceiling?" Amy Ta/NPR hide caption

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A status update's "meta" information, like its source device, can be used to help out a lame joke — or to drive the envy of frustrated early-adopters. NPR hide caption

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