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This screenshot taken from Twitter shows the company's posting on its official account Thursday, Sept. 12, 2013, that it has confidentially submitted an S-1 to the SEC for a planned IPO. Twitter is taking advantage of federal legislation passed last year that allows companies with less than $1 billion in revenue in its last fiscal year to avoid submitting public IPO documents. (AP Photo/Twitter)Copyright 2013 WRAL Tech Wire. All rights reserved.