Social Media #HappyBirthdayTwitter: Today is the fifth anniversary of first tweet There is some dispute about the wording of the first tweet; whatever it said, Jack Dorsey, the founder of Twitter, sent it five years ago today. By Michael SebastianMarch 21, 2011 SHARE Now that’s appropriate—perfect for a Trivial Pursuit question. The first-ever tweet, which came five years ago today from Twitter founder Jack Dorsey, was “just setting up my twttr.” To read the full story, log in. Become a Ragan Insider member to read this article and all other archived content. Sign up today Already a member? Log in here. Learn more about Ragan Insider.