Mark Zuckerberg and his people at Facebook are surely aware of the various developments concerning blockchain technology. They are closely watching social media platforms like Steemit and dtube to ensure Facebook will keep its users.
Even though he must be pleased with the revenue FB has been getting, Zuckerberg should be aware that ever more people are getting drawn to the idea of users being rewarded for their posts and comments - something which FB doesn't provide for. If this gathers momentum, there will be a very serious challenge to FB.
I believe it's only a matter of time before Facebook comes up with something like Steemit's model. However, it is very likely that Facebook will choose to develop its own version of SMT. Or maybe buy over Steemit lock stock and barrel to have immediate control over what is already in existence. Then add to this.
But whatever FB decides, I believe the future will be towards platforms like Steemit. It's time for content to be monetised and the rewards more fairly distributed.