Twitter is an online service that lets you broadcast short messages to your friends or "followers." It also lets you specify which Twitter users you want to follow so you can read their messages in one place.
Twitter is designed to work on a mobile phone as well as on a computer. All Twitter messages are limited to 140 characters, so each message can be sent as a single SMS alert. You can't say much in 140 characters. That is part of Twitter's charm.
In 2007 Twitter didn't come out with as many new features as much as other developers found way to use the open data API to create their own specialized applications. The result is a wealth of tools and services that take Twitter beyond its original intention, and make it something bigger.
Winner: Twitter (Twitter.com)