Facebook knows your face

...could be a marketing thing...

[tangor]

No Way to Hide Your Face from Facebook

Facebook now has better than a 97 percent chance to recognize you by simply looking at your face, which is roughly comparable to human facial-recognition skills. (Everyone reading this who is "bad with faces" might be surprised to learn we can, on average, identify faces 97.5 percent of the time.)

[breitbart.com...]
Nowhere to run, nowhere to hide.

[mack]

It's only a matter of time before your device logs you in based on this type of technology. Looks at you with it's camera (eyes) and knows who you are and logs you in accordingly.

Mack.