The social media firm blamed the fault on a “faulty configuration change”.
The company said the issue had caused problems across multiple platforms used by billions of people around the world.
Facebook said the faulty configuration change impacted the company’s internal tools and systems which complicated attempts to resolve the problem.
Cloudflare, which recently faced a similar internet outage issue, explained what this issue actually mean.
The company said it involves two elements which help the internet function: the Domain Name System (DNS) and the Border Gateway Protocol (BGP).