It's worth noting that the Messenger app requires none of the android app permissions to run. It will happily work with every single one of them turned off. It

It's worth noting that the Messenger app requires none of the android app permissions to run. It will happily work with every single one of them turned off. It also means facebook doesn't get how long you look at each thing in your newsfeed, which is nice. They still get to access all the messages, obviously.