Ben Popper, The Verge:
Twitter has filed paperwork with the Securities and Exchange Commission to become a public company, which will allow outside investors to buy and trade stock in the company in the coming months. The San Francisco company will trade under the symbol TWTR when it goes public, it revealed in the S-1 document it filed with the Securities and Exchange Commission.
Despite not being profitable, they hope to raise $1 billion during the initial public offering.