Twitterbot displays messages that you send to diggov via twitter. To do so, go to http://www.twitter.com/diggov and start following diggov. diggov will start following you soon after. Then send a direct message to diggov -
"d diggov [your message without brackets]"
If you'd like to send a message that is private and should only be visible to diggov members, use the following format-
"d diggov !private [your message without brackets]"