A screengrab of a YouTube video of the game Walking Dead from the Swedish gamer known as PewDiePie. Videos of people offering commentary while playing video games are wildly popular on YouTube. YouTube/PewDiePie hide caption

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Manny Cardenas, seen here with his 5-year-old daughter Zoe, has earned $16 an hour as a part-time security guard at Google. Laura Sydell/NPR hide caption

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Tech companies around the world have set up shop in the financial district in Dublin, Ireland. Peter Muhly/AFP/Getty Images hide caption

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A screenshot of Half the Sky, where virtual successes sometimes lead to real-life donations. Games For Change hide caption

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The Sony PlayStation 4 sells for $399. Pablo Blazquez Dominguez/Getty Images hide caption

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Napster founder Shawn Fanning in February 2001, after a ruling that the free Internet-based service must stop allowing copyrighted material to be shared. Paul Sakuma/AP hide caption

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The Ask.fm website has been linked to two bullying cases that led to suicides. Danny E. Martindale/Getty Images hide caption

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Cosmo Wenman generated this 3-D model of the Ares Borghese, based on hundreds of photos, from the Basel Sculpture Hall. Wenman publishes the scans online, so that anyone can use them to 3-D print a replica of the masterpiece. Courtesy of Cosmo Wenman hide caption

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Law professor Lawrence Lessig, shown here in 2009, is suing an Australian record label for threatening to sue him over an alleged YouTube copyright violation. Neilson Barnard/Getty Images hide caption

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Some reputation management companies required that its writers have a certain number of Yelp friends. Yelp says it welcomed the New York attorney general's crackdown on fake reviewers. iStockphoto.com hide caption

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