Did you know that the first announcement of the discovery of ice on Mars was by NASA on Twitter.com? Did you know that the Joint Forces Command and the Office on Women's Health in the Health and Human Services Department are using twitter to announce speaking engagements and deliver medical news and advice?

Did you know that you can receive Twitter messages on your cell phone, or your instant messaging client, or by e-mail, or via other Web 2.0 applications, such as Facebook?

Welcome to the new world of government communication.

• Psst! Are you Twittering yet?, By Heather B. Hayes, FCW, August 25, 2008.

See also Government Agencies Tweet @ Twitter, and Twitter Fan Wiki USGovernment, and Members of Congress who Twitter.