Here's less than 140 characters for ya: trivial texts or not, every one's all a-twitter about tweeting. Twitter operates a free digital service site that blends social networking with the ability to post short messages (or micro-blogs) limited to 140 characters or less, commonly known by users as "Tweets." Twitter's service is designed for use on personal computers and via mobile devices, such as iPhone and BlackBerry smart phones. When accessed through the Internet, Tweets are published on a poster's personal Web page. Tweets can be restricted to select viewers, or viewed by anyone. Evan Williams, Jack Dorsey, and Biz Stone co-founded Twitter in 2006.