Maybe this will appease the BGP gods

from here and here (image source)

After the global outage on Monday, I'm sure there's a lot more prayers and crossing fingers going on at Facebook these days. They do not want a repeat performance.

Single Point Of Faceb^H^H^H^H^H Failure

from here

I think it's safe to say that when even the doors are affected by your networking mishap, it's time to rethink having everything go through the same servers.