Twitter is an online service that enables you to 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 post to this "VMworld" feed from your Twitter account by posting:
d vmworld "message" (replace "message" with your text to display)
http://www.vmworld.com/vmworld/community/conference/twitter/