Stewart sent his first Tweet on Friday night from Charlotte Motor Speedway. It said: ''Ok so here it is. I'm doing my part to combat global warming because now that I'm officially tweeting, hell is freezing over!''
The three-time NASCAR champion had joked often that his representatives would not allow him to join Twitter for fear of the things he might post. He's a longtime Facebook user, but had otherwise shunned Twitter.
Dale Earnhardt Jr. posted his first tweet hours after winning the Daytona 500 in February. He surpassed 500,000 followers days after he sent his first 140-character missive.
Stewart's stats weren't too shabby: He had over 200,000 followers after his first tweet.