The definitive handbook of the pioneers of growth hacking, one of the hottest business methods in Silicon Valley and beyond. It may be hard to believe today, but there was a time when Airbnb was the best-kept secret among travelers and couch surfers, Pinterest was a niche website visited only by bakers and crafters, LinkedIn was an exclusive network for executives and top recruiters, Facebook was the unfortunate stepsibling of MySpace, and Uber was a struggling startup with no chance against the Goliath of New York's yellow taxis. So how did these companies go from such humble beginnings to the powerhouses they are today? Contrary to popular belief, they did not simply explode in popularity by building a great product and hoping for worldwide acclaim. Behind it all was a thoughtful, carefully implemented methodology.