Google is doing test flights of its balloons carrying Internet routers around the world. Last June, a balloon was released at the airport in Teresina, Brazil. Google hide caption

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President Obama, joined by Homeland Security Secretary Jeh Johnson (left), delivers remarks at the National Cybersecurity and Communications Integration Center on Jan. 13 in Arlington, Va. Obama discussed efforts to improve the government's ability to collaborate with industry to combat cyber threats. Kristoffer Tripplaar-Pool/Getty Images hide caption

itoggle caption Kristoffer Tripplaar-Pool/Getty Images

Arianna Huffington, president and editor-in-chief of The Huffington Post Media Group, speaks at the 2014 World Economic Forum. Reporters and editors in 15 countries will contribute to "What Works," her site's new initiative focused on covering positive news. Ruben Sprich/Reuters/Landov hide caption

itoggle caption Ruben Sprich/Reuters/Landov

A University of Missouri study shows that if your Facebook lurking triggers envy, then depression may follow. Adam Hester/Blend Images/Corbis hide caption

itoggle caption Adam Hester/Blend Images/Corbis

A Facebook worker at the company's headquarters in Menlo Park, Calif. Facebook announced it will start flagging hoax news stories in users' News Feeds. Paul Sakuma/AP hide caption

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Social media provides voice to movements and helps drive them. Picking the right platforms for these sensitive conversations, though, is a sign of our growing digital sophistication. iStockphoto hide caption

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There were $3 trillion worth of corporate mergers in 2014. Comcast's proposed acquisition of fellow cable company Time Warner was the largest at $45 billion. Gene J. Puskar/AP hide caption

itoggle caption Gene J. Puskar/AP

The four undergrads of the Diaspora team were given "a global commission to rebottle the genie of personal privacy" after scoring $200,000 in a Kickstarter campaign and support and mentorship from Silicon Valley's brightest. Henrik Moltke/Flickr hide caption

itoggle caption Henrik Moltke/Flickr

This Nov. 19 screenshot shows the cover photo of an unofficial Marine group on Facebook called Just the Tip, of the Spear. The group and those like it have been accused of promoting sexism and of acting as a forum for hate speech. Just the Tip, of the Spear - 21/Facebook hide caption

itoggle caption Just the Tip, of the Spear - 21/Facebook

Facebook CEO Mark Zuckerberg speaks to students at Sequoia High School in Redwood City, Calif. His company released a new, simpler privacy policy Thursday, but it does not make any big changes to how much data the company collects from users. Alex Washburn/AP hide caption

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A technician opens a vessel containing women's frozen egg cells in April 2011 in Amsterdam. AFP/Getty Images hide caption

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