Facebook chief operating officer Sheryl Sandberg addresses an interactive session organized by the women's wing of the Federation of Indian Chambers of Commerce and Industry (FICCI) in New Delhi on Wednesday. Chandan Khanna /AFP/Getty Images hide caption

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The Supreme Court will look at a case in its upcoming session dealing with what constitutes a "true threat" on Facebook. iStockphoto hide caption

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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

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Mark Zuckerberg kicks off the annual Facebook developers conference in San Francisco on Wednesday. Justin Sullivan/Getty Images hide caption

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Are we in a tech bubble about to burst? Facebook bought WhatsApp for $19 billion earlier this year. WhatsApp CEO Jan Koum speaks during a conference at the Mobile World Congress 2014 in Spain. David Ramos/Getty Images 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

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A few years ago I started getting mysterious notifications from hundreds of strangers on Facebook — dozens came in every day from all over the world. Figuring out what was going on took me back to my first day on Facebook, six days after it launched in February 2004. Joerg Koch/AP hide caption

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Facebook co-founder and CEO Mark Zuckerberg told James Bennet, editor in chief of The Atlantic, in September that he wasn't worried about whether Facebook is "cool." "We're almost 10 years old, and we're definitely not a niche thing at this point," Zuckerberg said. Win McNamee/Getty Images hide caption

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What the world was talking about on Facebook in 2013. The social media site released a review of the most popular topics, events, and places Wednesday. Facebook 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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On Wednesday, Facebook released a digital resource center to expand its efforts against online harassment. Facebook hide caption

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