Twitter on Thursday announced -- via a tweet -- that it has filed for an initial public offering under new rules that allow for less public disclosure for companies with less than $1 billion in revenue. The S-1 filing means Twitter can initially show its information to the Securities and Exchange Commission, which will privately tell the company any concerns it has. Twitter likely disclosed the filing, which is not required under the S-1, to control the story instead of having it leak, observers say.

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