I'm positively sure that mediablockchains like Steem, Golos, Synero, SingularDTV and other will replace old-style social networks... But the questions are: how many of them and witch ones in particular will succeed?

Steem has a huge advantage now - it's first of the kind, as a Bitcoin for Crypto. And the Graphene technology is really good. So I belive Steem has a good chances... But it will not get on top of the hill unchallenged, and that is good