A new app from Twitter, Periscope, has 10 million users and it’s only been available (iOS only) for 10 days! That’s an average of 1 million users per day. Periscope, is an app that allows you to beam live-stream video to all of your Twitter followers just a touch of a button. While the video below shows a man in a hospital getting a stem cell transplant, you can also use it for weddings, graduations, baby christenings, board meetings and more! Now, if Twitter can only figure out a way to monetize this app to keep it’s stock from tanking, they may be on to something!