This whole interview is so far the best advertisement for Zuck's toy but for me they are still in uncanny valley. When there is no ambient. When they make hand gestures that get completely lost ... and of course what they talk about in this short take-out.
Of course you don't need to shave to get the capture shaved or let your beard grow for months to get an impressive beard or whatever you want to look like.
... and then there is the privacy issues with this toy that's heavily controlled by one company.