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Re:Facebook’s dark matter: “secret” groups by pdog on Friday December 28, 2012 @09:01PM (#4980707)
People seriously didn't know about this? "Secret" Groups are probably the only reason that I and any of the friends I care about are still using Facebook.
Re:Facebook’s dark matter: “secret” groups by gurkendoktor on Friday December 28, 2012 @10:24PM (#4980966)
I would guess that the extroverted people who make up the blogosphere/tech journalism don't think about it because they post/tweet everything publicly by default.

It's a bit like lucid dreaming. I don't know how often I've heard "what, other people can't control their dreams? Really?" :)