Which was the first tweet on twitter?

Jack Dorsey published the first Twitter message at 9:50 PM Pacific Standard Time (PST). The first tweet was like this "just setting up my twttr."

http://twitter.com/jack/status/20

http://twitter.com/jack/status/20

The original name for the twitter service was twttr, inspired by Flickr and the five character length of American SMS short codes. Then they changed it to twitter. According to Jack Dorsey, Twiter means "a short burst of inconsequential information" and "chirps from birds."