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FreeThis is the major functionality that although initially looks just like Facebook friends, differ in one important area; categorization! Basically, circles is a way of categorizing your Google + contacts into groups.
Most importantly the categorization in Google + is EASY to do, you can add as many circles as you like and you can have one person in several circles. The only potential issue is for those of us that resembles Monica (in Friends) and over-organize.
