[kankroc]

I don't want to jump the gun and call it creepy just yet, but what is it for exactly?

[mcpherrinm]

The most common end-user use of face detection is probably adding filters and decorations to photos.

This isn't too hard to do in javascript, but I assume a native implementation is much faster.

I'm not sure why it would be creepy; face recognition is easily done locally. Every camera implements it, for example, for focusing on faces.

[type0]

My guess would be that it's intended to be used as some kind of second factor for authentication.