I agree with lupin_sansei. The article lacks a credible source to back up their conclusions. In fact, I believe just recently I stumbled upon some numbers that

I agree with lupin_sansei. The article lacks a credible source to back up their conclusions. In fact, I believe just recently I stumbled upon some numbers that suggest otherwise: because of the Internet people get caught up in the net of social marketing and start buying more books: "OMG!! everybody is reading this, I gotta buy one too" Several books became very popular this way: Freakonomics, Tipping Point, Long Tail. Seriously, without this largely Internet-based hype about Long Tail I cannot see an article like that (about something obvious) make a book, and a popular one.