TweepML is an extensible, open standard format that allows you to manage and share groups of Twitter users. TweepML provides online follow tools that you can link from your website and make it easy for people to follow everyone on it with a single click.
TweepML is an XML format used to represent a list of Tweeps (Twitter users). The primary goal of this format is to allow people to easily share between applications a list of Tweeps. TweepML is also extensible, which allows applications and services to augment its structure with additional data.
TweepML was invented by Marcelo Calbucci, you can learn more about TweepML by visiting http://tweepml.org/. Don’t forget to check: Tweeps That Provide Really Useful Resources For Web Design & Development.