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It would be more than five hours before services would begin to be restored. It meant not only was Facebook gone, but everything Facebook runs disappeared too. Others have provided a bit more detail on why Facebook vanished from the internet. Cloudflare — which had its own recent internet outage issues — has provided a detailed explanation about what happened.

The internet is a lot of connected networks. A lot. So that means to keep order of things, you need something like BGP to tell you where you need to go. DNS is essentially the address system for the location of each website — its IP address — while BGP is the roadmap that finds the most efficient way to get to that IP address. Facebook accidentally, we assume sent an update to a deep-level routing protocol on the internet that said, basically, "hey we don't have any servers any more xoxo".

Cloudflare said Facebook on Monday essentially told BGP through a series of updates that those paths to Facebook no longer existed.