Growth hacking is now a mainstream term in tech circles, particularly those that are consumer-focused. Growth hacking definitions abound, but generally emphasize a data driven, creative and flexibly opportunistic approach to customer acquisition. Many would argue that growth hacking is simply a new term for an old concept – marketing. While the functions, tools and skills require for growth hacking may be essentially the same as “marketing”, the psychology and mission of growth hacking feel totally different to me. When I hear “marketing”, I think soft, fuzzy, ambiguous, and cost center. When I hear “growth hacking”, I think maniacal focus on growth, scrappy, data driven, tech/tool savvy, and…