Good to know. I've yet gotten around to trying this out (just recently upgraded to a Marshmellow phone), I feared it was install > grant permssions > optionally revoke permissions. And I wasn't ready to try that with an app that came out of fb, given their track record.

Maybe that's an idea for an open source Android demo app - one that requests a certain set of (or all possible) permissions, and then simply displays the status of those permissions (granted/blocked).