What text did Jack Dorsey write in Twitter’s first post on March 21, 2006?

Twitter’s first post, written by Jack Dorsey on March 21, 2006, said “just setting up my twttr.”

Dorsey published the message while developing a short-message service inside Odeo, a podcast company in San Francisco. The lowercase wording reflected the service’s early internal name, “twttr,” which omitted vowels in the style of several early web brands.

The post was not a public announcement or a marketing slogan. It was a brief setup message sent during the service’s earliest testing phase. Twitter later became a public platform, but the original post remained a frequently cited milestone in its history.

A common mix-up is confusing the first post with the first account or the first post sent from space. Dorsey wrote the first post, while NASA astronaut Mike Massimino sent the first widely recognized tweet from space in 2009.