The _Liveson service will continue to tweet after your death, based on tweets already written. They promise to analyze them thoroughly, figuring out your tastes, preferences and how often you miss commas. Run in March 2013.

I hope, of course, that for the intended purpose you will have to use the service very soon, but no one interferes with seeing and testing. Of course, I don’t see any practical value, but the direction is very interesting.
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http://liveson.org