I'm unsure if this is the correct form - please move it if I have it wrong.

I've been contacted via my FB author page by two people who have read my book, but had Amazon not allow them to post a review. I've heard rumors of this sort of thing happening, but don't understand why Amazon is deleting reviews. These people purchased and read the book - they are frequent Amazon customers (with over $50 / year in purchases). Both say they've made some sort of protest to Amazon about it.

So, what's going on?