This document provides an overview of using Twitter for business purposes. It discusses Twitter's history and demographics, providing examples of how some businesses have effectively used Twitter and others that have not. The key points are that Twitter launched in 2006, now has over 500 million active users, and around 15% of online adults use the platform. Examples are given of Home Depot's successful Twitter strategy of engaging customers through tips, promotions, and user-generated content as well as examples of ineffective over-promotion.