E-mail isn’t that different from mail. The real divide, historically, isn’t digital; it’s literary. The nineteenth century, in many parts of the West, including the United States, marked the beginning of near-universal literacy. All writing used to be, in a very real sense, secret, except to the few who knew how to read. What, though, if everyone could read? Then every mystery could be revealed. A letter is a proxy for your self. To write a letter is to reveal your character, to spill out your soul onto a piece of paper. Universal literacy meant universal decipherment, and universal exposure. If everyone could write, everyone could be read. It was terrifying.
Jill Lepore, “The Prism”, The New Yorker (24 June 2013), 35.