I've thought this too. "You get to decide who is in a circle and then you decide who you share a post with, which could be circles, individual people (maybe also referenced by email) or make it public." It's hard to make work, though. "It did sound great to all of us, but failed because the bookkeeping was unmanageable and a detriment to socializing…on a social network!" I think we'll get it right when we're able to employ a personal AI to do the hard work of defining circules and assigning the right posts to the right people. We're probably not far away.
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