The problem is, people who care about their privacy do not want to be tracked when they’re not using the app. But if an institution wants to find out what devi

The problem is, people who care about their privacy do not want to be tracked when they’re not using the app. But if an institution wants to find out what devices subscribe to certain groups or pages They could correspond the times that a pages media posts, with the times a range of devices received a notification from specific apps. It’s that easy