You might see corporate hashtags at the end of nearly every commercial, but Twitter itself has never advertised on television until now, doing so even ahead of Facebook. Featuring NASCAR driver and Twitter user Brad Keselowski as part of the partnership between the two, the spot debuted yesterday during the Pocono 400 race. It promotes the sport’s Hashtag Page, Twitter’s new destination for branded search results and editorial content. Thus, the ad invites users to visit the page, but more importantly, it also makes a pitch to other corporate sponsors in the process. Well played.