Facebook users around the world have reported difficulties in getting on the site in what appears to be a rare outage of the service.
When attempting to load the site, a message seen by some users reads "Sorry, something went wrong".
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The PM is expected to slam the "scandalous" failure of the prisons sector today as he outlines his plans for a modern prison system.
Outbreaks of rain will continue to move eastwards across the UK this evening.
A boy was left hanging precariously out of a car after it crashed on a bridge