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How loose can the connections be that permit a social network to be called a network? Let me suggest a kindergarten reunion as the limit case.
Out of the blue a few months ago I received a phone call. John Baglow? Did you attend kindergarten in Richmond Hill in 1952? Why, yes. Would you like to attend a reunion of the Class of '52? You bet! But ask me why I so readily agreed and I'd have a very hard time explaining.