Summary: On October 4, 2021, at 15:39 UTC, the social network Facebook and its subsidiaries, Messenger, Instagram, WhatsApp, Mapillary, and Oculus, became globally unavailable for a period of six to seven hours. The outage also prevented anyone trying to use “Log in with Facebook” from accessing third-party sites. On This Episode The Devs Like Us Podcast discusses the outages and share their opinions on being on call and troubleshooting production issues