140 characters at a time - Twitter has become what will likely be the largest Silicon Valley IPO since Facebook. Even though Twitter lost money the last three years, revenue tripled last year. And many analysts say Twitter's losses are a non-issue-because they have been attracting more advertisers. Twitter may be only eight years old but this deal, which aims to raise a billion dollars, and could make the company worth about $15 billion is going to make a lot of people very wealthy.
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