https://www.cnbc.com/2018/04/10/zuckerberg-says-facebook-is-working-with-special-counsel-mueller-in-probe.html >Facebook CEO Mark Zuckerberg testified to a joint hearing of the Senate Judiciary and Commerce committees Tuesday that Facebook is cooperating with Special Counsel Robert Mueller's investigation. >"I know we are working with them," Zuckerberg said during the hearing.