The document summarizes key concepts in social media marketing including theory, case studies, and new trends. It discusses inbound marketing, word-of-mouth marketing, and engagement marketing. A case study is presented on a company that offered coupons for social media follows and email subscribers, growing their likes, subscribers, and sales. New areas discussed include social media dashboards, location marketing, gamification, and social media monitoring. The document concludes by advising marketers to integrate social media into an affordable, measurable plan and other marketing activities.