Same here. For a while when going out with friends and someone wanted to take a group photo I asked if it was being uploaded to Facebook, and in that case I would get out of the camera sight, but then I realized any photo will end up on FB anyway because most people don't give a damn about their and others privacy, so today I don't allow anyone to take photos of myself in any situation, and ask them not to tag me at any cost should I appear in any photo by mistake. That way I'll probably just delay a bit the day my photo will appear with full name and personal details: I can't smash all phones of the people taking selfies in a pub or on the beach with no consideration for whoever is sitting/walking/bathing 5 meters from them. Yes, that is extreme, just as FB complete lack of respect for privacy.

If I had the right connections I'd push for some countermeasures to be added to the phone OSes, such as for example a barcode that disables the camera or covers the wearer's face through image recognition if taken from a short distance: just wear a shirt/badge with that barcode and your privacy is guaranteed: either they move away or point the camera elsewhere.