We all like receiving a personalized service, whether it is being recognized by the Maitre d’ at our favorite restaurant or having a range of books offered to us by Amazon when we are looking for a specific title. Sometimes we may wonder just how these personalization algorithms work. I was just looking for a book on Notre Dame Cathedral in Paris and among the books I was offered was one on the history of Britain from 1945-1951 and one on the history of the Habsburg family.
