Let's start with a number: 37 million.
That's not page views or a figure about student debt. It's the number of subscribers to the PewDiePie YouTube channel.
PewDiePie is Felix Kjellberg, a video gamer with a legion of fans he calls "bros." He's the latest in a series of YouTube stars who have decided to publish a book.
"This Book Loves You" is a collection of aphorisms, bits of wisdom-slash-jokes, paired with photos and other visuals. It's coming out in October simultaneously in the U.K., Germany, Norway, Sweden and France and