According to numerous reports, the social media sites were down in many parts of the US, including the Northeast, as well as overseas.
Facebook continues to work on the issue affecting its family of apps.
"We're working to resolve the issue as soon as possible", said the firm.
According to reports, some users are getting a message that says "Facebook will be back soon".
We'll update this post as we hear more from Facebook.
Users are reporting that they are having trouble posting to the sites, while others are receiving an error code or can't log in at all.
However, Facebook didn't elaborate on why its websites or apps were down.
Are you experiencing problems with Facebook and Instagram today?
Facebook finally tweeted - two hours after they started having issues.
Facebook-owned Instagram and WhatsApp were also down for many.
On Wednesday's issue, Ms Brooker added on Twitter: "Look at what happens when we let one company control everything".
The live outage map on downdetector.com shows outages spread across the U.S.
If you can't post a new status on Facebook, it's not you.
Some Twitter users who work in "Facebook-centric" jobs, expressed their panic and distress at being unable to use the platform. Social media users have written in from Canada and Las Vegas to point out the outages in their part of the world.
The story is developing...
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