So you want it so that instead of being a public forum where any user can read and comment on anything, you only interact with people you have 'let in'? That would be a very different type of platform than what we have today. I don't know if the majority of Steemians would even want that. Personally, I like the way it is setup, where you can interact with whoever you want.
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There is no way to prevent users from posting comments about anything to the block chain. Even if we establish a protocol to do that, developers can find ways to embed data and subvert it.
Synereo perhaps attempts to restrict data distribution to coteries by not putting all the data on a globally accessible blockchain. But even then, we can't control what others in our coteries choose to do with the data we've shared with them, i.e. they can distribute it outside our coterie. The only plausible way to prevent people from talking about you on a social network is to create obscure identities. Once you are a public figure, then people will talk about you and there is nothing you can do to stop this. We can have a feature in which a blog author offers a recommended block list, but each reader's client program will be free to ignore it.
For those users who are not widely known, then I guess Synereo's local storage of data has the advantage that not all data can be easily found by anyone on a global blockchain. So individual privacy may be improved (at least if not w.r.t. to the NSA).
However it has the disadvantage that new readers can't just discover and browse. I've read that Medium has 20,000 weekly active bloggers serving 25 million readers.
We can simulate Synereo's private coteries on a public global blockchain by employing broadcast encryption.