5 lessons from the October 2021 Facebook outage
On October 4, 2021, Facebook services went off the grid gradually, and then suddenly at 15:39 UTC. It took nearly six hours to restore service to normal. With over 3.5 billion users facing a lengthy downtime using one or multiple products from Facebook, Inc. (now known as Meta Platforms, Inc.) conversations flooded the internet about what caused the downtime issues on the American social networking service.