SAN FRANCISCO, CA - NOVEMBER 03: Marissa Mayer (L) and Adam Lashinsky speak on a panel during the Fortune Global Forum - Day2 at the Fairmont Hotel on November 3, 2015 in San Francisco, California. (Photo by Kimberly White/Getty Images for Fortune)
SAN FRANCISCO, CA - NOVEMBER 03: Marissa Mayer (L) and Adam Lashinsky speak on a panel during the Fortune Global Forum - Day2 at the Fairmont Hotel on November 3, 2015 in San Francisco, California. (Photo by Kimberly White/Getty Images for Fortune)