One of the things I always do every time I finish reading a book, I go to www.amazon.com
and then I search for that particular title. Then I rate it (1 to 5 stars) and mark ¨I own it¨.
This feeds my account database at Amazon.com and facilitates in getting recommendations for similar publications.
Even if I have never read a particular book, in case I'm doing research I may also use Amazon recommendations to get similar suggestions of titles for me to browse. It is easy and sometimes provides very interesting surprises