What do the likes of Uber, Airbnb and Dropbox have in common?<p>Billion-dollar valuations? Check.<p>Slick Office Space? Check.<p>Customer Referral Programs? Check.<p>Wait what was that last one..That’s right.. Customer referral programs. They’re used by all three of these companies.<p>Now I’m not saying that these programs were the silver bullet, I don’t believe any company grows from a single tactic. These companies grow by using a playbook of different growth tactics and create a culture of innovation where creative and analytical people can thrive.