Dale Earnhardt Jr. follows through on vow, joins Twitter

The account had over 235,000 followers even though he had never sent a tweet before Sunday night's victory. Copyright 2014 Associated Press. All rights

The account had over 235,000 followers even though he had never sent a tweet before Sunday night's victory.

Copyright 2014 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.