https://www.reuters.com/article/us-facebook-stocks/facebook-shares-drop-as-executives-quit-christchurch-live-stream-shooting-stirs-outrage-idUSKCN1QW29C >Shares of Facebook Inc fell as much as 5 percent on Friday to their lowest in nearly three months after the surprise departure of Chief Product Officer Chris Cox, at a time when the company is again being scrutinized over its handling of privacy, extremism and political content.