periodization

HASTAC Scholar Whitney Trettien of MIT raised important questions of historicity in a comment on my previous blog posting, "The Historian's Dilemma and the Question of Generations": http://www.hastac.org/node/1666 I'd like to follow up with some thoughts that respond to her question and take up historian Robert Darnton's idea that we are living in the "fourth great information age": http://www.hastac.org/node/1662