Liberty Media has decided to put Barnes & Noble down. Should investors follow the smart money or read on?

The media company controlled by John Malone has sold 90 percent of its roughly 17 percent stake in the country's largest bookstore chain, a move that sent the shares down 13 percent in midday trade Thursday. While Liberty didn't make any specific complaints about the business, it was likely fed up with trying to compete with Amazon. Liberty and B&N declined to comment.