Now that you mention that, that's a good reason. Would it be possible for facebook to use this to build a database of photos of people's faces or facial featur

Now that you mention that, that's a good reason. Would it be possible for facebook to use this to build a database of photos of people's faces or facial features? I really don't like the sounds of that. I apologize -- I really don't use any social media personally outside twitter on occasion.