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So isn't Facebook like a feature away from this? The circles thing?
Jacqui Cheng's profile photoJosh Long's profile photo
Facebook had it before: Facebook Lists. But it was so unintuitive and hidden that virtually no one knew about it. Eventually they decided to do Groups instead and mostly abandon lists (they still exist but they're not being innovated on or anything)
I use Facebook Lists all the time. Personal posts stay private (to specific Lists only), while links to articles I've written and other things of general interest go to all my Facebook friends.

The major difference between Facebook and Google is, of course, the number of people with whom I'm connected.
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