QUOTE : TechCrunch, Fast Company, Mashable, Inc., Entrepreneur, and countless other publications. LinkedIn and Hacker News abound with job postings: Growth Hacker Needed. Their job isn’t to “do” marketing as I had always known it; it’s to grow companies really fast—to take something from nothing and make it something enormous within an incredibly tight window. And it says something about what marketing has become that these are no longer considered synonymous tasks. The term “growth hacker” has many different meanings for different people, but I’ll define it as I have come to understand it: A growth hacker is someone who has thrown out the playbook of traditional marketing and replaced it with only what is testable, trackable, and scalable. Their tools are e-mails, pay-per-click ads, blogs, and platform APIs instead of commercials, publicity, and money. While their marketing brethren chase vague notions like “branding” and “mind share,” growth hackers relentlessly pursue users and growth—and when they do it right, those users beget more users, who beget more users. They are the inventors, operators, and mechanics of their own self-sustaining and self-propagating growth machine that can take a start-up from nothing to something.