Twitter makes $1 billion IPO filing public, confirms 215 million monthly active users

http://www.blogcdn.com/www.engadget.com/media/2013/09/twitter-working-1380527593_thumbnail.jpg

Less than a month after announcing its plans to go public, Twitter has today made its S-1 filing with the SEC public, offering the most detailed look yet at at the inner-workings of the company. The company is looking to raise $1 billion on 472,613,753 shares of common stock, and will operate under …