This document discusses the foundations of marketing through social media. It defines social media as forms of electronic communication through which users create online communities to share content. It then outlines the four zones of social media: social community, social publishing, social entertainment, and social commerce. It provides examples of successful social media campaigns from Dunkin' Donuts and Coca-Cola that engaged consumers by prompting them to participate and share content online, connecting with them personally, and using powerful calls to action in their messaging.