Facebook, Instagram and WhatsApp appear to have gone down worldwide - leaving users in social media darkness.
All three of the social networks - which belong to Facebook - have been having issues since 11am.
Monitoring website downdetector.co.uk has received hundreds of complaints across the UK and Europe.
Hundreds of people have taken to Twitter to report the issues.
Those hoping to log on are being presented with an error message saying the site "can't be reached".
As a result, people are unable to also access Facebook Messenger on PCs or laptops.
One user said: " Instagram , Facebook and WhatsApp are down. Thank you Zuckerburg, great service."
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A second chipped in: "Facebook, we have a problem."
Jamie Strachan tweeted: "Here we go again. Facebook and Instagram are down and now everyone will rush to Twitter to complain about it."
Many people seem baffled as to why the sites were experiencing issues yet again.
They have been plagued with technical difficulties, with outages lasting hours sometimes.
Downdector.co.uk has received more than 100 complaints since 11am on Sunday. It is not clear at this stage what the problem is.
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The outages are being reported worldwide.
The issue also appears to have hit other countries - with users in Morocco, Ukraine, the Philippines and Greece also complaining.
Facebook are yet to comment on the outage.
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