What does this mean? Half a billion users of the global social network Facebook voluntarily, without any pressure from outside, compose detailed dossiers on themselves, talk about their passions, habits, thoughts, post photographs, name the names of friends, show on maps the places they have visited, share plans for the future, etc., etc. Not a single spy organization could even dream of such a rich archive! And recently, former CIA employee Edward Snowden accused American intelligence services of conducting active intelligence on social networks. So how dangerous is it to be a Facebook user? What can you write about there, and what can you absolutely not write about, what can you believe and what can’t? The author of the book reveals many of the secrets of this popular social network, exposes myths and reveals the mechanism of unprecedented manipulation of consciousness.