Facebook CEO says fake news spread on site did not influence result.
Takes reins from Christie as President-elect moves to assemble team.
Participates in Arlington National Cemetery event for final time as president.
McColley gets 6th-highest GOP slot.
Portland police term gathering of 4,000 a riot.
Is highest-ranking American official ever to visit continent.
President-elect has not minced words about his approach to environment and energy policy.
Only 17 of 125,000 magazines sold.
Neither had Trump winning Ohio decisively.
Meeting is symbolic start to the transition of power to the nation's 45th president.