It may not have been the most exciting news of the week, at least when it comes to fans of Dale Earnhardt Jr. A reluctant participant on Twitter for years, Earnhardt burst into the Twitterverse this week with a flourish of revealing tweets that have given fans insight into his life they never knew before. ''I don't know what I was thinking, why I didn't get on there earlier,'' Earnhardt said from Phoenix International Speedway on Friday. ''It's a great way to tell people things you appreciate and it's instant.'' Earnhardt has had a Twitter account since 2008, when JR Motorsports signed up (at)DaleJr. That changed early Monday morning, hours after Earnhardt won his second Daytona 500 and posted a photo of himself with the trophy: ''Tonight seemed like as good a night as any to join Twitter. More...