Facebook users say they are unable to use the app at the moment with people unable to see the newsfeed or comments.
DownDetector started receiving reports of problems with the site at around 5pm on Monday. Hundreds of Facebook users also took to Twitter to complain about problems using the social media site and app.
Some people said they cannot make comments and the newsfeed appeared to be down. Others said they could not look at their own, or favourite pages.
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@terancethatch tweeted: "Who broke @Facebook? It's not working right now. #Facebook
Twitter user @ColetrainCTP wrote : "I can’t make comments and my news feed is down on Facebook. #facebookdown
User @reysterlanfrey wrote: "Is Facebook down? I cannot access my news feed, my Facebook page, and my favorite FB pages."
And @lastofavari said: Is #Facebook down for ya all? I was about to share my fresh YT video and then FB failed to fetch a thumbnail. And then FB page's content stopped loading entirely."
Facebook has not yet commented on the issue.