"Speaking as a computer scientist, I view all of these as sort of poor man’s email systems. In other words, they have aspects of an email system, but they don’t have a full offering. To me, the question about companies like Twitter is: Do they fundamentally evolve as sort of a note phenomenon, or do they fundamentally evolve to have storage, revocation, identity, and all the other aspects that traditional email systems have? Or do email systems themselves broaden what they do to take on some of that characteristic?"
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From Google CEO Eric Schmidt
Microblogging Will Marginalize Corporate Email « I’m Not Actually a Geek
