Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Do NOT buy this "book"

I don't normally leave negative comments but this book is a total joke, and Amazon.com should pull it. Theres better books out there about Ebay written by real authors. Check under Dennis L. Prince, Neil J. Salkind, Nancy L. Hix, or Arden Snyder. They documented using Ebay much better than this incompetent clown. I agree -- 5 star ratings were written by the author and I use the term author lightly.