I got one of these a few months ago. I could tell it was fake before I even answered, but I was curious so I pointed my own camera at a blank wall and answered. It was creepy to see my friend's face (albeit one that was obviously fake if you knew what to look for) when I answered.
What about the voice? How it sounds like etc? Maybe from videos people post. Shits getting weird. Glad I deleted everything from FB long time ago. Actually looking back its crazy thay had all that info on my profile, pics and videos. Makes no sense now. Lots of people still dont care and have a lot of infro freely available online.