It’s hard to pinpoint when we decided there is no longer a line between our private and public selves. It could be the invention of the cell phone, which allows us to share our most intimate dramas with total strangers as we walk down the street gabbing. Or maybe the Information Age has blurred our boundaries by enabling us to put every stray thought we have on the Web for all the world to comment on. Whatever it is and whenever it happened, that break with apparently outdated notions...