This document discusses social media and its advantages for social interaction. It defines social media as social interaction among people through virtual communities and networks to create, share and exchange information or ideas. It then provides examples of different types of social media like social bookmarking, social news, social networking, and social photo and video sharing. The document also discusses how brands can use social media marketing to generate leads, referrals, and brand recognition by integrating social media into their marketing plans and influencing consumer behavior before and after sales. It emphasizes that existing customers are a brand's best assets and social media allows marketers to remind customers to return through sharing, liking, and tweeting.