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A news ticker in New York’s Times Square announces Twitter’s IPO filing.
A news ticker in New York’s Times Square announces Twitter’s IPO filing.
(ERIC THAYER/REUTERS)

Ad revenue sands shifting under Twitter's feet

Twitter Inc.’s SEC filing in advance of its IPO came in a little bit longer than 140 characters, but it offered investors simplicity as well as an easy-to-understand value proposition – not unlike the microblogging service itself. But despite rapidly growing revenue from digital advertising, some observers voiced concern over its $69.3-million (U.S.) loss in the first half of 2013. If Twitter’s not making money now, skeptics ask, why should we believe that it will once it goes public?