The problem with algorithms is they tend to be kept secret...

For example if I were trying to get a person hooked to the application I'd ensure they have a good experience. If there is someone like the parent poster that only opens the app at an infrequent basis it's probably not a good idea to scare them away.

But your FB junkie. It doesn't matter if they only click on their friends feed or not, show them ad after ad after ad because they are coming back anyway.

No evidence here on my part, since FB wouldn't really confess either way, but if I were manipulating people that would be one of the screwdrivers in the toolbox.