Several of Facebookโs products are suffering partial outages, affecting users globally.
Facebookโs main product, its Messenger service, and image-sharing site Instagram have all been disrupted.
The cause of the interruption is not yet known, or is yet to be made public.
"Weโre aware that some people are currently having trouble accessing the Facebook family of apps,โ the company said in a statement.
"Weโre working to resolve the issue as soon as possible.โ
While Facebookโs main service appeared to load, users reported not being able to post.
Those on Instagram were not able to refresh feeds or post new material. Facebook Messengerโs desktop version did not load - but the mobile app appeared to be functioning as normal.
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Estimates suggest the issue began around 1600 GMT.
Facebook's other major product, messaging app WhatsApp, appeared to be unaffected.