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

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Caroline De Haas, 34, launched after a company responded dismissively to her complaint against its sexist advertising. Courtesy of EGAE hide caption

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Watch out, Congress: Girl Up activists came to the nation's capital in June to lobby for issues affecting girls in the developing world. From left, Alexandra Leone (New Hope, Pa.), Grace Peters (Flemington, N.J.), Aklesiya Dejene (Chicago), Isabella Gonzalez and Erika Hiple (Stockton, N.J.) Ryan Kellman /NPR hide caption

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The human Y chromosome (left) holds the code for "maleness"; that's the X on the right. Andrew Syred/Science Source hide caption

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Hackers pose at Disrupt Hackathon in 2011. Araya Diaz/Getty Images hide caption

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