Facebook or myspace ads are generally a difficult method. There are a great number of draconian rules available, generally stemming from recent types of abuse or complaints zynga becomes. Any time adequate adverts are generally claimed and they all express anything in common, fb will exclude whatever causes the account, and sellers can simply modify.
This can lead to some illogical methods. The 20% book rule is somewhat notorious that they are just this. Why would you getting limited by simply 20 percent of any picture as article? More to the point, exactly why is it regulated with a grid device however motions of copy a small number of pixels up will all of a sudden render an image okay?