September 12, 2013, 5:29 PM — Twitter announced -- on Twitter, of course -- that the company has filed with the U.S. Securities and Exchange Commission for an initial public offering.
"We've confidentially submitted an S-1 to the SEC for a planned IPO," Twitter said Thursday in a tweet.
"This tweet does not constitute an offer of any securities for sale," the company said.
Twitter could not be immediately reached to comment further.
The value of an IPO for the social network is unclear. Twitter claims to have just over 200 million active users.
(More to follow)