The 7-year-old company posted on its official Twitter account that it has "confidentially submitted an S-1 to the SEC for a planned IPO." A subsequent tweet said simply: "Now, back to work." It's accompanied by a blurry photo people working in the company's San Francisco headquarters.
Under the law, Twitter's financial statements and other sensitive information contained in the IPO filing must become publicly available at least 21 days before company's executives begin traveling around the country to meet with potential investors — a process known as a "road show."
Those presentations will be orchestrated by Twitter CEO Dick Costolo, a former stand-up comedian who will now get an opportunity to take his act to Wall Street.
Twitter's IPO has been long expected. The company has been ramping up its advertising products and working to boost ad revenue in preparation. But it is still tiny compared with Facebook, which saw its hotly anticipated IPO implode last year amid worries about its ability to grow mobile ad revenue.
Since it was founded within another startup and named after the sound of chirping birds in 2006, Twitter has established itself as a cultural touchstone while growing from a few thousand geeky users to more than 200 million today. Its users include heads of state, celebrities, revolutionaries and journalists. Unlike Facebook, which insists that its users go by their real names, Twitter leaves room for parody and anonymity. As such, there are accounts for Jesus Christ and Lord Voldemort, Harry Potter's mortal enemy.