LONDON (Reuters) - A British student, who hacked into Facebook's internal network risking "disastrous" consequences for the website, was jailed for eight months on Friday in what prosecutors described as the most serious case of its kind they had seen. Glenn Mangham, 26, a software development student, admitted infiltrating Facebook from his bedroom at his parents' house in York in northern England last year, sparking fears at the U.S. company that it was dealing with major industrial espionage. ...