“A new Facebook experiment scans your photos with facial recognition technology when you take pictures and prompts you to send the photos to your friends.
Facebook isn’t doing this without your permission, but you may not have realized you’ve given them permission to begin with. To use Photo Magic, you have to allow Messenger to have access to your camera roll to begin with before it sends you any notifications. If you’ve ever sent your friends a photo via Messenger, you’ve likely already opted in.
If it still sounds a little creepy to have Facebook looking through all your photos, especially as you take them, you are basically left with two options: You can turn off the send-to-your-friend notifications, and you can turn off Facebook’s facial recognition feature.”
Thanks to Insider