Well what‘s wrong with Steemit? As far as I know they are growing. Of course not as fast as Facebook did, but if you think about that Facebook is a very strong competition and Steemit mainly for crypto users at the moment. Beside that it is more focused on blogging and still quite userunfriendly. Also they have some very useless rules there like let people use bots to get more upvotes and money but in the same moment they get crazy about if you tag your posts wrong lol the Steemit community is mostly driven by greed instead of good content. And that is maybe the point why Steemit ultimately will fail to get really big.

But Sphere looks much more useful as a ‘replacement‘ for Facebook here, at least in the beginning for crypto user.