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Facebook was offline for many of its users at 5.30pm on 24 SeptemberReuters

UPDATE 17:57 Panic over, Facebook appears to have been plugged back in

Facebook is offline and unavailable for a large number of its billion-plus users worldwide. The social network is displaying a message that reads: "Sorry, something went wrong. We're working on it and we'll get it fixed as soon as we can."

Facebook down error message
Facebook users were greeted with this apology as they tried to access the site on 24 SeptemberScreenshot

A map produced by Down Detector shows that Facebook is unavailable mostly for users in the UK and western Europe, as well as on the east coast of the US. The websites Down Right Now and Down For Everyone or Just Me are also offline, as they appear to have been struck by a flood of traffic checking to see if Facebook is working or not.

facebook down map
Map shows Facebook users complaining about the site being offlineDown Detector

As this story was being published, the outage spread across Europe, covering much of France, Germany, as well as covering more of the US east coast and spreading to California of the west coast. Problems are also being reported in East Asia and Australia.

Facebook's mobile applications appear to be working, albeit slowly, and Facebook-owned WhatsApp and Instagram appear to be unaffected by the outage.

The last time Facebook suffered a major outage was in March 2015.

Facebook down downdetector
A graph shows how reports of Facebook being offline spiked massively shortly after 5pm on 24 SeptemberDownDetector

By 6pm and after an outage lasting around 40 minutes, Facebook appeared to be back online for most users, including IBTimes UK.