CHARLOTTE, N.C. (WVLT-TV) -- NASCAR drivers have only two speeds. Fast and slow.
And when their cars aren't going 200 miles an hour, for many drivers, the thumbs are, and that includes 53-year old Mark Martin
"My first thoughts were, 'I didn't want to do it,'" Martin said.
Little did the 5-time Sprint Cup runner-up know that it was going to be a part of his job description.
"I walked into MWR (Michael Waltrip Racing) and Michael said, 'You gotta an IPhone?' I handed it to him. A few minutes later he handed it back. He said 'you're 55MarkMartin on twitter.Now, get started.'
Three weeks later, @55MARKMARTIN has nearly 14,000 followers. Martin says he's having fun with Twitter. He's not alone.
"I love Twitter," Greg Biffle recently said during the 2012 Sprint Cup Media Tour. "You're always making somebody mad."
Biffle has nearly 40,000 followers. With so much of the race day spent waiting, it's during that time Biffle passes the boredom.
"Sitting on pit road for 20 minutes, waiting to make my runs, so I'm Tweeting away and answering questions (from fans.)"
As one of the sports' more polarizine figures, it's no surprise that Kyle Busch has one of the top followings (more than 108,000). Busch says, though, he does get annoyed with the site when Twitter turns bitter.
"You have people hiding behind screen names sometimes," Busch said. "It's ridiculous, fictional little wanna be's out there, writing up their own little deal, we dont need those."
But not everyone is on Twitter.
"There's too many rules and regulations," Clint Bowyer said.
And too many people getting carried away.
"I don't want to know what people are thinking. I've actually read, 'I'm thinking about going shopping.' I just don't know why I needed to know that."
You won't find Tony Stewart on Twitter either. The 2011 champ admits that he has thoughts that are best kept to himself.