There's a Facebook page called Fitness Babes (I can't post links yet) and they are actively promoting few things. They have a Facebook shop that directs buyers to amazon to buy Ab Rocket and stuff like that. What do they get from it? Is this like Amazon affiliate program or something? Isn't selling/advertising stuff like that is not against Facebook terms and conditions? Other thing that they are actively promoting is their app on Google Play which is free. Do you think there are in-app purchases or are there any other reasons why it would be beneficial to promote the app?