https://www.techradar.com/news/facebook-gave-smartphone-makers-access-to-user-data

Facebook has been called out for allowing a number of tech companies, including smartphone manufacturers, access to a sea of data about its users.

Reports claim 60 device manufacturers, including the likes of Apple, Samsung, Microsoft and BlackBerry had partnerships with Facebook allowing them access to user data. In return, manufacturers could offer customers features like messaging or the 'like' button.