WWMT - wwmt.com - Search Results The following is an archived video story. The text content of that video story is available below for reference. The original video has been deleted and is no longer available. Twitter says it has filed IPO documentsNEW 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.