Facebook significant event 2021 Facebook outage
October 4, 2021, global service outage
On October 4, 2021, Facebook had its worst outage since 2008. The outage was global in scope, and took down all Facebook properties, including Instagram and WhatsApp, from approximately 15:39 UTC to 22:05 UTC, and affected roughly three billion users. Security experts identified the problem as a BGP withdrawal of all of the IP routes to their Domain Name (DNS) servers which were all self-hosted at the time. The outage also affected all internal communications systems used by Facebook employees, which disrupted restoration efforts.
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