Growth hacking is a marketing technique developed by technology startups which use creativity, analytical thinking, and social metrics to sell products and gain exposure.[1][2] It can be seen as part of the online marketing ecosystem, as in many cases growth hackers are using techniques such as search engine optimization, website analytics, content marketing and A/B testing. Growth hackers focus on low-cost and innovative alternatives to traditional marketing, e.g. utilizing social media and viral marketing instead of buying advertising through more traditional media such as radio, newspaper, and television.[3] Growth hacking is particularly important for startups, as it allows for a "lean" launch that focuses on "growth first, budgets second."[4][5] Facebook, Twitter, LinkedIn, Airbnb and Dropbox are all companies that use growth hacking techniques.[6][7]