This document discusses digital marketing tools and strategies to reach and engage audiences to maximize return on investment. It recommends tools like Sprout Social, Offerpop, and Nanigans for digital marketing as well as Facebook's Power Editor and Twitter's native platform. Digital marketing consists of SEO, SMO, SEM, and SMM. The document advises targeting the most interesting audiences, starting small without spending much, and controlling advertising by location, budget, and time for high returns on investment through digital marketing.