Where do we Tweet when Twitter gets Thwacked?

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When events happen around the world, Twittererers send their tweets to alert us all. But what happens when Twitter isn't there to accept our 140-character thought balloons? Where do we say what we need to say when our saying place shuts down?

Twitter has been down or mostly down for at least two hours. What happens to all those tweets that never got tweeted? Are they saved in Tweetdeck awaiting confirmation that they can fly off to achieve Tweetisfaction?

Oh, the humanity. But seriously, when people can't tweet, do they just, oh God, dare I say it, just talk to other people? Face to face????