This document provides an introduction to Twitter and strategies for using Twitter effectively. Some key points: - Twitter allows rapid communication with 27.3 million tweets per day and over 1 billion users expected by 2013. - Companies can use Twitter for customer service, reputation management, product promotion, event promotion, and research. - To build a following on Twitter, users should participate, respond to others, promote their content, and share a compelling profile. - Common conventions on Twitter include using @ to mention others, # for hashtags, and RT to retweet others.