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" 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. "
― Ryan Holiday , Growth Hacker Marketing: A Primer on the Future of PR, Marketing, and Advertising
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" Growth hackers resist this temptation (or, more appropriate, this delusion). They opt, deliberately, to attract only the early adopters who make or break new tech services and seek to do it as cheaply as possible. In fact, part of the reason the scrappy start-ups, services, and apps in this book might not always be well-known or topics of daily conversation is because their founders have focused their energies on product development with an eye toward growth—they’re now millions of members strong without any superfluous “buzz.” They got to mass market by ignoring the urge to appeal to the mass market, at least to start with. "
― Ryan Holiday , Growth Hacker Marketing: A Primer on the Future of PR, Marketing, and Advertising