Looks like sometimes it's good to be a 'techno dinosaur'. My phone hasn't got a camera, so I have to use my standard little digital camera for pictures, and as a result no problems with this type of 'tracking'. It's rather sad that we have to be aware of these possibilities.
I think I better tell my son about it. He has a very up-to-date phone with camera and takes a lot of pictures of his very cute baby daughter.
Thanks for warning us, Lynn.