There are a lot of blockchain-based social media platforms out there. Of course, the pioneer is no other than Steemit. Afterwards, other platforms existed such as Whaleshares, Weku, Serey, Golos, etc. I am a member of some of them, and one of the platforms I am active in is HyperSpace.
HyperSpace is kind of unique because it gives UBI (Universal Basic Income) which you will use in amplifying (the same as liking) a post. I already collected thousands of coins there, and yes, HyperSpace (AMP) already has a value. However, the money earned from the platform is still not withdrawable. Users have been waiting for that. In fact, activities has dropped significantly because many got tired of waiting. For now, the future is not yet clear for the platform. But I think it will boost once wallet was already enabled.