MENLO PARK, CA - FEBRUARY 10: Facebook COO Sheryl Sandberg speaks during a Safer Internet Day event at Facebook headquarters on February 10, 2015 in Menlo Park, California. California Attorney General Kamala Harris delivered the keynote speech at a Safer Internet Day event that is designed to promote safe, effective use of the internet and mobile technology. Safer Internet Day is celebrated in over 100 countries on the the second Tuesday in February. (Photo by Justin Sullivan/Getty Images)
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