Your new business went online yesterday and you've got a marketing budget of zero. How are you supposed to create a movement around your product? How can you get to your first thousand - or million - customers? Starting from zero, it feels impossible. Enter the growth hacker. You may not have heard of growth hacking yet, but you've certainly used the billion dollar brands built by it: Hotmail, AirBnB, Facebook, Dropbox, amongst many others. Growth hackers thrive on doing what traditional businessmen would consider impossible: creating something from nothing.