Surely when Vannevar Bush imagined his hyperlinked memex or Jorge Luis Borges his Library of Babel or Tim Berners-Lee his World Wide Web, what excited them wasn’t the possibility of reading the boldfaced words “nympho starlets” in a printed novel, racing to the nearest computer to type a U.R.L. into a browser and watching a YouTube clip of James Blunt singing “You’re Beautiful” over scenes of Sharon Tate in “The Fearless Vampire Killers.”