Twitter goes down all the time, sure, facebook has dropped off, yeah...

But neither of these things have ever happened for a full day. If twitter goes out, refreshing a few times (this was true even a couple of years ago when the downtime was really bad) usually lets you get through. The worst I remember seeing was a few hours down.

Same goes for facebook. The worst I can recall right now is part of the oauth system bailing out for a few hours.

AWS going out like this is an entirely different disaster. Not only was it down for an entire day, but there were a ton of eggs in the basket.