As I covered last week, Facebook has begun to release demographing information via their advance Flyers system. Valleywag appears to be hyping this up to be Facebook’s stealth ad system. Honestly, there is nothing stealth about this. Facebook announced the release of their new advertising system over a month ago. The primary benefit of this new system is that it is based on a cost-per-click (CPC) model rather than cost-per-impression (CPM).