I've received many blog comments from authors, and even more emails about my reviews. I have interviewed many of the authors on my internet radio business show, or on my my blog. For some authors, I have reviewed more than one of their books. I follow and am followed on Twitter, and friended on Facedbook, by many of the authors whom I have reviewed and interviewed. They are all such nice people too. :-)
I'm skeptical but I did end up having two authors stop by my blog where they left comments. Of course I wondered why Linda Wisdom would come to my blog but it was nice. I don't think there's anything wrong with it but I really don't go around trashing books either.
A few have stopped by just to say hi and thank me for the review and one emailed me to thank me.
I do post reviews for books I don't enjoy but I always find something positive to say about those books too. So far none of the authors have responded to those.
I did get a response from an author about a published review in a magazine that wasn't favorable and her response was nice response. Other reviewers bashed the book because the character wasn't likeable and she said that I got what she was going for... an unlikeable character. :)