That\u2019s the title of a new book by New York Times technology reporter Kashmir Hill. Her book is both deeply researched and downright scary, as spelled out in the book\u2019s subtitle: A Secretive Start-Up\u2019s Quest to End Privacy As We Know it. A glimpse of your face in any photo you\u2019ve ever uploaded can now lead to anyone discovering details of your life \u2013 both on-line and out there in the world.