Why Did Facebook Go Down? – Computerphile

Just what was it that took Facebook, Instagram & WhatsApp offline on 4th October 2021? – Dr Steve Bagley investigates!

previously titled “Facebook’s Day Off”

Facebook announcement on the outage:
The visualisation software Steve was using was BGP play, downloaded from the RIPE website.

This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham:

Computerphile is a sister project to Brady Haran’s Numberphile. More at

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