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Facebook says that starting soon, ad targeting will "include information from some of the websites and apps you use," making ads more relevant to users' interests. iStockphoto hide caption

itoggle caption iStockphoto

"People are grappling with identity when they become parents, and they're also grappling with identity in terms of who we are online," says psychologist Daphne de Marneffe (not pictured). Jonathan Ross/iStockphoto hide caption

itoggle caption Jonathan Ross/iStockphoto

Twitter CEO Dick Costolo says the company has to bridge the gap between the brand's global awareness and user engagement. Ethan Miller/Getty Images hide caption

itoggle caption Ethan Miller/Getty Images

It would take more than 1,000 1,200-page volumes to contain the content of Wikipedia, but PediaPress has made an example volume to show what it might look like. "Our goal is to allow everyone to explore the physical dimensions of Wikipedia," says PediaPress founder Christoph Kepper. PediaPress hide caption

itoggle caption PediaPress

A woman looks at her smartphone as she walks by a banner of Turkish prime minister Recep Tayyip Erdogan, in Istanbul on March 21. On Thursday, Turkish court orders banned Internet users from accessing Twitter, but the social media company posted instructions on how to tweet from a phone. Ozan Kose/AFP/Getty Images hide caption

itoggle caption Ozan Kose/AFP/Getty Images

Porn has a distinct problem that less racy media companies don't have: Users are afraid of leaving a digital record. Paid sites are trying to lure viewers out of the shadows and into credit card payments. iStockphoto hide caption

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Facebook software engineer Brielle Harrison demonstrates the website's expanded options for gender identification at her company's Menlo Park, Calif., headquarters. Harrison, who helped engineer the project, plans to switch her identifier to "Trans Woman." Noah Berger/AP hide caption

itoggle caption Noah Berger/AP

Emily Kitfield, 16, says she's not sure if she would have been able to come out to her parents and community without being able to reach out to others online. Courtesy of Emily Kitfield hide caption

itoggle caption Courtesy of Emily Kitfield