Apparently Qwest was experiencing difficulties that lead to Facebook being unavailable to many people. Early in the design of the Internet, the TCP/IP layer was designed to deliver packets by many different routes. It was designed to be failure-tolerant so that this type of thing would not happen for this type of reason.
Soooooo, how/when did we engineer ourselves into a spot where that basic design tenet does not work? I don't really give a healthy RA about Facebook being down. I do give an RA about things working as designed.
Footnote: Programmer screw-up caused the problem, not design failure. Better, in a way, but not good.
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