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SAN FRANCISCO, CA - NOVEMBER 03: Facebook COO Sheryl Sandberg speaks during the Fortune Global Forum on November 3, 2015 in San Francisco, California. Business leaders are attending the Fortune Global Forum that runs through November 4. (Photo by Justin Sullivan/Getty Images)

SAN FRANCISCO, CA - NOVEMBER 03:  Facebook COO Sheryl Sandberg speaks during the Fortune Global Forum on November 3, 2015 in San Francisco, California. Business leaders are attending the Fortune Global Forum that runs through November 4.  (Photo by Justin Sullivan/Getty Images)