That's not how the Face API works. An app needs the user to be logged into FB, and then the app can attempt face recognition for that user and their direct FB f

That's not how the Face API works. An app needs the user to be logged into FB, and then the app can attempt face recognition for that user and their direct FB friends only. For a government to do this it would need collusion with Facebook; with or without the Face API. As for satellite surveillance - even if modern military satellite imagery had that kind of resolution (it doesn't), and ignoring atmospheric conditions (a bit hard to do for the UK), it's hard to imagine how they would do face recognition from the tops of peoples heads. With all due respect, your paranoia is misplaced.