In 1964, media visionary Marshall McLuhan coined the indelible phrase “the medium is the message,” all but predicting the Internet and how advances in communications technology would come to shape the symbiotic relationship between what is said and how. The ascendency of digital, social, and mobile has progressively empowered once-passive consumers, now equal partners in content selection, redistribution and even creation. The good news is that digital channels provide unprecedented opportunities for targeting and personalization; the bad news is audiences now control how and with what they engage, tuning in and out as they desire.