Ellenberg did the Hawking Index last year, for most unread book
"The reason I was doing this, you know, I have my own book out. Of course, like any author, I was looking at my own metrics and I looked at the highlights and found that they were all from the first 3 chapters and I was kind of upset. But being a mathematician I started to look at other books too and then I saw that I was actually sort of ahead of the pack."
http://www.npr.org/2014/07/12/330889...t-unread-books