FILE - Britain's Queen Elizabeth II arrives at television studios, in Belfast, Northern Ireland, in this Oct. 21, 2010 file photo. Britain's Queen Elizabeth II is launching an official Facebook page, offering fans daily updates on her engagements, the royal household said Sunday Nov. 7, 2010. (AP Photo/Peter Morrison, File)
January 18, 2012 7:53:02 AM PST
LONDON (AP) - January 18, 2012 --
Palace officials have announced details of a massive pageant on London's River Thames to mark Queen Elizabeth II's Diamond Jubilee year.