Facebook Messenger has suffered a major outage, leaving users unable to send or receive messages.
It is one of several Facebook apps to experience difficulties, with both the main Facebook app and Facebook-owned Instagram also going down.
It is not yet clear what caused the issue, though it is the latest in a series of significant outages for the social media giant.
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According to website monitor DownDetector, users all over the world are affected.
Facebook did not immediately respond to a request for comment.
More to follow.