Facebook (META -0.80%) may be having potentially serious problems with ad quality on the social networking site. According to BTIG Research, "dark posts" are on the rise, allowing marketers' ads to not be tied back to their fan pages. In other words, marketers could abuse this privilege and create marketing campaigns that are only focused on grabbing users' attention without any regard to the brand they are trying to promote. In this video, Motley Fool contributor Steve Heller goes through the details of this development and how it fits into the bigger picture.