75 votesGary McPherson commented
A competitor does something like this using ribbons. I'm not sure how feasible it would be to track all the books, the data involved spread over the number of users would be costly and/or possibly sluggish. That said, I really want some sort of feature that will sync histories or allow a ribbon/bookmark sort of function that you can set and will sync with your other devices. In today's world, it is not realistic to think people are going to read from only one device or read different things on each device.