What was the first ever tweet on Twitter?
Twitter Co-founder and CEO Jack Dorsey posted the first ever tweet on Twitter on March 21, 2006, when the service was still called Twttr. The post read, "just setting up my twttr". However, the social networking site was launched for public on July 15, 2006. Twitter had over 330 million monthly active users in 2017 fourth quarter, according to filings.