If you still think "the customer is king," you're falling behind. Today's most powerful growth engine is users--people who interact with a company through digital media and technology even if they have never spent a dime. Become indispensable to users and the profits will follow. As CEO of the digital marketing agency HUGE, Aaron Shapiro goes inside blue-chip companies to advise them on how to thrive in this new business reality. He led an extensive...