Minor nitpick, but I'm not also not sure I buy the argument that a group that any member can add other members to, automatically and always gets better over tim

Minor nitpick, but I'm not also not sure I buy the argument that a group that any member can add other members to, automatically and always gets better over time. I don't have any data one way or another, but it seems entirely plausible to me that a group could morph and change with new additions until it becomes something you don't want to be a member of any more. But basically this comes down to what other people have already noted: Google+ Circles != Facebook Groups