A major, potential risk to the social media giant’s dominance is an open-source network called Steemit. What makes Steemit distinct from the litany of social media garbage is that it runs on its own blockchain-powered cryptocurrency called steem.
http://investorplace.com/2017/06/facebook-inc-fb-fear-social-media-kingslayer/#.WVhck4iGNEY
Facebook and reddit maybe youtube those company are too smart to let steemit beat them.