This document provides an introduction and overview on how to use Twitter for marketing purposes. It explains what Twitter is, how it works, who uses it and why it can be effective for marketers. It then provides step-by-step instructions on setting up a Twitter account and profile, including choosing a username, adding important profile information and customizing the look. The document concludes by explaining how to engage on Twitter through tweeting, replying to others, using hashtags and direct messaging.