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Do you remember your first Tweet? Well, we all got a look at the first Tweet from anyone in Twitter's S-1 filing, courtesy of co-founder Jack Dorsey. He didn't even use up all of the 140-character spaces at his disposal.
(He also appeared to be a fan of that Web 2.0/3.0 trend of dropping the vowels. Let's all rejoice that they kept those in the official moniker after all.)