According to the tracking website www.tweetcongress.org 79 members of Congress are now using Twitter to send messages also called tweets to constituents.
Twitter allows users to post brief real-time messages about what their doing or where they are. Among congress members using the service, two thirds are Republicans, including at least three who've just started using the service this week.
"The way I think of it is, we now have a new public bulletin board," said Sen. Claire McCaskill (D) Missouri.
"And it goes to my 6,400 followers, who can then send it to their hundred or thousand or two thousand followers, who send it to their hundred or thousand followers, and it's geometric, it goes like this immediately," said Rep. John Culberson (R) Texas.
Republican representative John Culberson of Texas sends out the most messages of any member of Congress, followed by House Speaker Nancy Pelosi. Republican Senator John McCain has the most followers.
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