Facebook, Instagram and WhatsApp have come back online after all three social media platforms went down on Monday evening.
It's believed the outage that lasted for around six hours on October 4 was caused by 'a faulty configuration change'.
The social media giant says there is no current evidence that user data was compromised.
In a statement after the outage, Facebook said: "To all the people and businesses around the world who depend on us, we are sorry for the inconvenience caused by today's outage across our platforms.
"We've been working as hard as we can to restore access, and our systems are now back up and running.
"The underlying cause of this outage also impacted many of the internal tools and systems we use in our day-to-day operations, complicating our attempts to quickly diagnose and resolve the problem.
"Our engineering teams have learned that configuration changes on the backbone routers that coordinate network traffic between our data centres caused issues that interrupted this communication.
"This disruption to network traffic had a cascading effect on the way our data centres communicate, bringing our services to a halt.
"Our services are now back online and we're actively working to fully return them to regular operations.
"We want to make clear at this time we believe the root cause of this outage was a faulty configuration change.
"We also have no evidence that user data was compromised as a result of this downtime."
In a Facebook post as the sites seemed to go back to normal, Chief Executive Mark Zuckerberg wrote: "Facebook, Instagram, WhatsApp and Messenger are coming back online now.
"Sorry for the disruption today - I know how much you rely on our services to stay connected with the people you care about."
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