Bill Gates has finally joined Twitter -- and he has been gaining followers at a rate of 20,000 per hour since word spread of his debut tweet. At last count, @BillGates had gained more than 200,000 followers since going live Tuesday. "The last time we've seen a new Twitter user with this kind of momentum was Oprah when she first joined," writes Ben Parr. "Mr. Gates is not only the world's richest man, but one of its most popular, it seems."

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