This document provides an overview of Twitter and how to use it effectively. It describes Twitter as a microblogging site where users can post tweets of up to 140 characters. The document then discusses how Twitter can be used to find real-time search results on topics, monitor topics and people by following their tweets, build relationships with others on the site, promote yourself or your business as a personal marketing tool, get and provide help to others, and get instant news updates from services. It also suggests Twitter can be used to instantly communicate with friends about what you're doing.