How true - many books I have read would fall into this category. However in this modern age with many authors on Facebook, sending a message is now much easier. After reading The Book Thief by Markus Zusak I checked him out on Facebook and send off a message about how much I enjoyed his book.
But for those who have since died, who would you like to send a message to?
Lucy Maud Montgomery
Lousia May Alcott
to name just a few.