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Re:Show HN: A few weeks ago, I started prototyping the Circl... by michaelchisari on Sunday March 13, 2011 @10:19PM (#2321029)
I've had privacy circles in Appleseed since about 2006. You might want to check it out:

http://opensource.appleseedproject.org

Although the circles aren't auto-generated, the user creates them.

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