Facebook acknowledged the problems in a tweet at 1.49pm NY time Wednesday, saying, "We're aware that some people are now having trouble accessing the Facebook family of apps".
According to the website downdetector.com, outages were heaviest in North America and Europe, but some users appeared to be affected in other regions.
At around 11 a.m. PT, the Facebook developers dashboard showed a "partial outage" for the past two hours, saying it was now seeing "increased error rates".
Facebook took to Twitter to update users on the situation.
People from all over the United States and other countries said they could not access the website and received error messages.
A Down Detector map shows issues reported in the UK, Canada, Belgium and the US.
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Facebook has experienced the largest ever outage in the history of the site..
A site that monitors website outages, said the Facebook problem also affected parts of the USA, including the East and West Coast; parts of Europe and elsewhere. Many people went on Twitter to vent their frustration.
"You make it sound as if it's the end of the world just because you can't be on Facebook".
Facebook posted to Twitter reassuring users that the site would be back online. While they have not publically identified the problem, they do say that it is not a dedicated denial of service attack. Some users were frustrated in attempts to sign into apps like Spotify and Tinder that require a Facebook login.
While the outage continued, The New York Times reported that U.S. prosecutors have launched a criminal investigation into the social network's practice of sharing users' data with companies without letting them know.
For our newsroom, the outage has been preventing any new posts to our Facebook page or responses to user comments.