I / Questions of society: discretion, transparency and liberties.1 Return of the Leviathan?2 On the use of social networks and e-mail3 myths & utopias: towards a "new society"?II / Questions of interest: evolution or rupture?4 Economy: moving into the post-industrial economy5 A new creative destruction?6 Digital Innovation & Trusted SocietyIII / Political questions: does digital have a master?7 Challenge for public action: to undergo, guide or coerce?8 A case study: regulating algorithms9 Digital and reason of State: an impossible equilibrium?IV / Prospects: a new avatar of technical progress?Magic of progress or end of history?Discrete data, perception and representation of reality;Schizoidism of digital change.