No clue what I'm doing yet but if I can make it to ten thousand on something I'll be happy.
In the title you say "Best Science Fantasy Fiction Books".
But in the post you say "Best Science Fiction Books".
There are so many... but I'll just stick to the 'medieval' part of your question.
The Kingdoms of Thorn and Bone by Greg Keyes.
This question is so hard for me to answer. I would put A Song of Ice and Fire and The Malazan Book of the Fallen at the top of my series' list. Of those
I never felt as if reading books was diminished because of facebook. I feel as if the interwebs has helped book readers. It helps people find books