Because it’s creepy as hell.
Some users may not know that Facebook already has a built-in face-scanning feature that’s turned on by default. This allows it to scan your uploaded photos and videos and use it to identify other images of yourself. If someone uploads a photo of you, Facebook can then inform you about it (just in case you didn’t agree to that image being uploaded).
But Facebook’s current privacy problems meant that some users aren’t already comfortable about their faces being scanned by the social media network, which led to the company turning off the feature by default since last month.
But if you want to check if Facebook’s facial recognition is really off, you can check out the guide below on how to do it step-by-step using the mobile app.
1. On the Facebook app, tap the three-line menu on the right
2. Look for the Settings option under the Settings & Privacy menu
3. Scroll down and look for the Face Recognition option under Privacy
4. You will then see the Face Recognition status on the next window
5. Tapping that will take you to a menu where you can turn it off or on
The steps shown above is for the Facebook app running on iOS devices, but Android users should have a similar setup as well.