Introduction
A marketing executive at American Apparel reads Andrew Chen's article declaring that "Growth Hacker Is the New VP of Marketing" and realises his entire profession is under siege. Companies worth billions of dollars, including Dropbox, Instagram, and Pinterest, were built without traditional marketing teams, budgets, or agencies. A new breed of marketer has emerged: the growth hacker, someone who discards the old playbook in favour of what is testable, trackable, and scalable. Their tools are e-mails, pay-per-click ads, blogs, and platform APIs rather than commercials, publicity, and lavish spending.