Why do recommendation systems so often miss the mark? Tom Vanderbilt, author of the new book "You May Also Like", explains why personal taste is so hard to compute.

Have you ever recevied a recommendation from Netflix or iTunes that seemed like the opposite of anything you'd actually like? Why is it so hard to make a good recommendation? Tom Vanderbilt has just written a book on recommendation systems, "You May Also Like: Taste in an Age of Endless Choice". Here is a short interview with the author from CBC Radio.