On Twitter, what phrase did Jack Dorsey post as the platform’s first tweet in 2006?

On Twitter, Jack Dorsey’s first tweet in 2006 was “just setting up my twttr.”

Dorsey posted the message on March 21, 2006, while Twitter was being developed inside the podcasting company Odeo. The service was initially called twttr, following an early naming style that omitted vowels. Twitter later became the company’s public name.

The short message was not intended as a grand announcement or a cultural slogan. It was a simple test post showing that the system worked. Dorsey’s account, @jack, became closely associated with the history of the platform and with Silicon Valley’s rapid experimentation culture.

A common mix-up is confusing Twitter’s first tweet with its first public launch or with later famous posts. The platform opened to the public in July 2006, several months after Dorsey’s test message. The tweet’s lowercase wording and missing vowel are part of its exact text.