Book Rat Badges!
As you can see, so far there are three: Nail-biters, Magic, and Romance. When you see one of these badges posted on a review, it means the book fell into one of those categories.
The Claw-biting Rat Badge is for nail-biting books that keep you on the edge of your seat. They can be anything from crime and suspense novels, mysteries, or just plain good storytelling -- the type of books you can't put down because you just have to know what's going to happen next.
Reviews with the Wizard's Rat Badge are magical in some way -- they may deal directly with magic (like Harry Potter) or indirectly, as in some magical realism and sci-fi/fantasy books. Or maybe they are books that just cast a spell on the reader.
The Love Rat Badge is for books with a good love affair -- ranging from hot and steamy paranormal romances to tween-squeeing, heart-squeezing, swoon-worthy fare.
If you see one of these Rat Badges pop up, you can safely bet that book is going to have a great element of deliciousness in one of those categories. And as I said, there will probably be more to come, which I will add to the list.
If you review a book you think is worth a badge, feel free to use it, I don't mind; rats are very sociable.