https://www.theguardian.com/technology/2019/jan/31/apple-facebook-campus-permissions-revoked-teens-access-data-iphone-app

Move comes after Facebook paid teens for access to data using iPhone app

Apple has left Facebook’s campus in disarray after the company revoked the social network’s permission to build or run employee-only applications, according to reports. Employees were reportedly left unable to read cafeteria menus, call for inter-office transport or use versions of the social network’s own apps.