Dale Earnhardt Jr. is not only the most popular male race car driver in history (and ironically once a fired dealership service mechanic), but he’s also easily accessible, using Twitter to keep up on current events. He enjoys a good old-fashioned debate, and is known for his informal AMAs on social media, taking pride in answering every tweet himself. On Instagram, he mixes slices of life with professional-looking auto racing photography. Though he technically joined Twitter in 2008, Dale methodically waited until he made a big comeback before he threw himself fully into the medium, to the delight of his 1.3 million followers.