Yahoo! CEO Marissa Mayer got right to the nitty gritty, tweeting about the American Visionary Arts Museum. Of course, she didn't start tweeting til 2009, a bit later than her peers, so she had more time to get the inspirational tone down pat. Not so for Jack Dorsey, CEO of Square and founder of Twitter. He tweeted for the first time March 21, 2006 — the very day Twitter was founded, when no one knew just what it was yet. "Just setting up my twttr," he posted. A true pioneer on unsettled grounds. That founding tweet now has almost 17,000 retweets.
Discovered the American Visionary Arts Museum in Baltimore -- extremely cool in terms of art and its philosophies (http://www.avam.org/)— marissamayer (@marissamayer) July 21, 2009
just setting up my twttr— Jack Dorsey (@jack) March 21, 2006
Future Instagram CEO Kevin Systrom hopped on board a few months later, in June 2006, in the halcyon pre-tycoon days when he could chill back more.
But, Reddit founder Alexis Ohanian was already building his empire by the time he tweeted in 2007, and alerted the world he was emailing. Hardcore.
Sitting with jack and Noah sipping on a tea— Kevin S. (@kevin) June 29, 2006
email. hardcore email.— Alexis Ohanian (@alexisohanian) March 5, 2007
Check out a few more famous first tweets here. [Business Insider]