This document provides an introduction to social media and how businesses can establish an online presence using platforms like blogs, LinkedIn, Twitter, and Digg. It defines each platform, provides examples of how businesses can use each one, and emphasizes creating original, engaging content to connect with customers and establish expertise in their industry. The key platforms discussed are blogs for regularly sharing content; LinkedIn for professional networking; Twitter for real-time updates; and Digg for getting content recommendations. Participation on each network through posts, answers, and connections is recommended to build an online business presence.