Twitter

Twitter is a microblogging service that can be accessed via text, web, or SMS. It allows networks of users to stay connected and update each other on their activities wherever they are. Most people’s initial reaction to Twitter is of unleashed inanity, but once you have invested time in building interesting and useful networks it is a real aid to productivity and knowledge sharing. There are now Twitter clones, such as Yammer, suitable for use within the corporate environment.