Book excerpt: Twitter has tens of millions of users and its active "tweeters" and followers look to it to answer to the question, "What's happening?" Businesses both large and small can quickly and easily send out highly targeted messages to key customers using Twitter. However, simply grasping only the mechanics of Twitter and flogging a message nobody cares about isn't enough to make a measurable difference. Worse, using Twitter the wrong way can damage a company's brand. The Complete Idiot's Guide® to Twitter Marketing blends an understanding of Twitter's powerful tools and reach with marketing savvy and the key to really engaging followers and converting them to customers. It also covers new features such as the increasing importance of search engine optimization.