Facebook late on Friday became the first American internet company to reveal the full extent of official US government demands to hand over information about its users, including the controversial secret requests at the centre of the National Security Agency surveillance scandal http://link.ft.com/r/YIQXNN/T1764S/3O9UZD/B5ZYD5/6APZIK/W1/h?a1=2013&a2=6&a3=15