In artist Paul Kleeâ??s The Twittering Machine, the bird-song of a diabolical machine acts as bait to lure humankind into a pit of damnation. Richard Seymour argues that this is a chilling metaphor for our fixation with social media. His new book probes the human side of the machine, asking what weâ??re getting out of it, and what weâ??re getting into.