Twitter aired its first TV ads to tout its advertising potential on Sunday during a NASCAR broadcast on Time Warner Inc.'s TNT cable network. The ads, produced as part of a partnership between Twitter and NASCAR is part of Twitter's effort to tout itself as a serious social media business. Using NASCAR to demonstrate how hashtag pages could work, Twitter aired six different 15-second spots during Sunday's Pocono 400 race that introduced the "#NASCAR" hashtag and directed viewers to the URL "twitter.com/#NASCAR."