Indeed facebook working on its own proprietary blockchain and cryprocurrency to deploy on its own platform just speaks for itself. They see where steemit is going with rewarding users with specialized crypto for content and how this is attracting more and more users.. With this, obviously their sales will be affected if users continued diverting to steemit.
Facebook bringing in tokens as well would influence the many users it already has to exchange and use the tokens, completely making him a competition of himself. Being the world's central banker would be in inches to reach for Zuckerberg. Let's just wait and see how this goes. I just hope it doesn't come to pass.