The social media network was down for users across the world on Wednesday (03.07.19), when a glitch left people unable to upload or view photos, videos and other files.
On Thursday (04.07.19) morning, the problem - which also affected Facebook's Messanger app, as well as Facebook-owned apps Instagram and WhatsApp - was resolved, and the company took to Twitter to claim the unspecified issue had been accidentally "triggered" during "routine maintenance".
They wrote: "We're aware that some people are having trouble uploading or sending images, videos and other files on our apps. We're sorry for the trouble and are working to get things back to normal as quickly as possible. #facebookdown
"Earlier today, some people and businesses experienced trouble uploading or sending images, videos and other files on our apps and platforms. The issue has since been resolved and we should be back at 100 percent for everyone. We're sorry for any inconvenience."
The momentary error comes after Facebook and Instagram suffered their longest period of disruption ever in March this year, which lasted 14 hours.
And the latest problems also followed disruptions on Tuesday (02.07.19), when Cloudflare - a company that provides internet security to website operators - suffered a fault that caused thousands of websites to display "502 errors" when visited.
The company said in a statement: "Our testing processes were insufficient in this case and we are reviewing and making changes to our testing and deployment process to avoid incidents like this in the future."