Published: Sep 12, 2013 5:14 PM EDT
Updated: Sep 12, 2013 5:22 PM EDT

NEW YORK (AP) - Twitter is going public. The short messaging service says it has filed confidential documents for an initial public offering of stock.
    
San Francisco-based Twitter Inc. posted on its official Twitter account that it has "confidentially submitted an S-1 to the SEC for a planned IPO."
    
Twitter's IPO has been long expected. The company has been ramping up its advertising products and working to boost ad revenue in preparation.

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