Friends and family--especially those who are on my FB friends list--may be the victims of Amazon's scurrilous bias against family support, as the monstermonopoly seems to be rejecting your reviews on the Amazon page for The Book of Cain. If you find Bezos being such a bum to you, you might want to trip on over to Goodreads.com, where you should be able to leave a review without any problem (even though that site is owned by Amazon, I think).
It's actually a good site for anyone who loves books and wants to discuss or review them. So go ahead and sign up for a free goodreads account, look me up, follow me as an author, and drop a nice review of The Book of Cain. Here's the book's link.