Facebook has revealed the reason why their site, alongside WhatsApp and Instagram, went down for several hours on Monday.

The social media and messaging apps suffered a serious issue which led to them being unavailable for millions of people worldwide.

People took to Twitter to joke about the outage, with celeb Bette Midler writing: "Today, #Facebook & #Instagram were down for so long I almost felt good about myself!"

Experts shared their thoughts on what happened, with some claiming it could have been a huge 'internal mistake' and others suspected sabotage.

The sites went down shortly after 4pm GMT and didn't come back online until after 11pm, with millions still affected.

It's believed they were up and running after midnight, almost eight hours after they crashed.

Facebook has now told users "configuration changes on backbone routers" were the cause of the sites going dark.

They said the changes "that coordinate network traffic between data centers caused issues that interrupted communication.

"LSO have no evidence that user data was compromised as a result of this downtime.

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"Disruption to network traffic had a cascading effect n the way our data centers communicate, bringing our services to a halt.

"Facebook says underlying cause of outage also impacted many of the internal tools and systems."

Earlier in the evening, social networking giant was forced to apologise for the biggest outage in its history, with billionaire boss Mark Zuckerberg saying that he is "sorry" to "the huge community of people and businesses around the world who depend on us."

Harvard professor John Zittrain said in a tweet: "Facebook basically locked its keys in the car".

Some Twitter users had speculated earlier that the incident could have been a cyberattack, but this has not been proved true.

The New York Times reported Facebook employees were unable to get into certain buildings due to the outage.

They also noted employees had to communicate with each other through other messaging services like Zoom due to the problems.

DownDetector claimed more than 10million reports had come through over Facebook, the biggest surge they've had in their history,

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