Story still developing.
Facebook suffers outrage on January 27, around 12:10am central time, and is stayed down for about 40 minutes.
No reason has been posted at the moment, but it has affected both Facebook and Instagram.
Countries affected are United States , Asia and Australia.
The reports are coming in of a DOS attack, but nothing has been confirmed.
This would mean that data centers and backup locations have been affected.
Update: As of 1:15am central time, service has been restored.
Facebook has not given a reason for the outage still being developed.
Update: the outage was caused by a change Facebook made.
Facebook reported having 1.25 billion users in September 2014.