Facebook has Algorithms for the user to create conversion took part by Facebook link Ads. Newsfeed display on both Mobile and Desktops, shown on the right side to the Banner and a partner of the apps on Facebook.
Facebook have Algorithms for creating conversion to user participation by Facebook link Ads. Will be shown on the Newsfeed. And the Mobile Desktops, showing the right side and the Banner on apps as an affiliate of Facebook.