Can’t delete the Facebook app on your Android smartphone? That’s because Facebook paid the maker of that smartphone extra money to prevent the app from being deletable.
According to this very good article by Sarah Frier on Bloomberg, “Facebook declined to provide a list of the partners with which it has deals for permanent apps, saying that those agreements vary by region and type. There is no complete list available online, and consumers may not know if Facebook is pre-loaded unless they specifically ask a customer service representative when they purchase a phone.”
For non-deletable installations, Facebook says the app can be “disabled,” which means it doesn’t collect data, etc., but cannot be deleted.