https://www.cnbc.com/2018/04/05/facebook-coo-feels-deeply-personally-responsible-for-data-leak.html >Facebook COO Sheryl Sandberg echoed CEO Mark Zuckerberg's rhetoric on Thursday, by taking personal responsibility for letting third parties access Facebook user data without permission. >"I feel deeply personally responsible, because a lot of mistakes were made," Sandberg said in an interview with Bloomberg.