Faked Faces

Been examining the use and misuse of facial recognition for a project.   You can tell that from recent posts.  The below shows how faking is being done, with examples of the faces at the click through.  Here the challenge is, how effectively can we detect if the faces are real?     And what is the nature  of the training set required?

These Incredibly Realistic Fake Faces Show How Algorithms Can Now Mess with Us  By Technology Review 

These faces don't seem particularly remarkable. They could easily be taken from, say, Facebook or LinkedIn. In reality, they were dreamed up by a new kind of AI algorithm. .... 

From Technology Review