The "@DaleJr" Twitter account has 230,000 followers, although Earnhardt never used it until he won the iconic race Sunday evening, USA Today reported.
His first Twitter post featured a photo of himself and the trophy and the phrase, "Tonight seemed as good a night as any to join Twitter. How is everyone doin'?."
Earnhardt Jr. won the rain-delayed race after finishing in second place three times in the past four years.
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