https://techcrunch.com/2021/10/04/facebook-whatsapp-instagram-return/

Facebook’s day-long outage is by far its longest and most extreme in years. At around 9 a.m. on the U.S. West Coast — where the social giant is headquartered — Facebook, WhatsApp, Instagram and Facebook Messenger seemed to vanish from the internet.

The outage continued through market close, with the company’s stock dropping around 5% below its opening price on Monday. By midafternoon, services were beginning to resume after Facebook reportedly dispatched a team to its Santa Clara data center to “manually reset” the company’s servers.