Personal information about the new MI6 head has been exposed on Facebook in a major security blunder, the Daily Mail reported Sunday. Sir John Sawers was set to take over as chief of the Secret Intelligence Service in November, putting him in charge of Britain's espionage operations abroad. However, his wife's Facebook entries have exposed potentially compromising details about where they live and work, their friends and where they spend their holidays, said the paper. Among the information was the fact that the intelligence chief's brother-in-law is an associate of historian and Holocaust denier David Irving. After the Mail informed the Foreign Office of the blunder, all the material was removed from the Internet. The British newspaper quoted senior politicians as saying that the security lapse raised serious doubts about Sawers' suitability to head the intelligence service.