Definition: Given a 'poster' sentence and a corresponding 'response' (often, from Facebook or Reddit)classify the sentiment of the given response into four categories: 1) Positive, 2) Negative, 3) Neutral, and 4) Mixed if it contains both positive and negative.
Input: Poster: Have you visited http://www.77shadowstreet.com while logged into Facebook? If so, be sure to browse the newspaper articles on Silas's Desk in the first room...  Responser: I've been told I cannot buy this book 'till January 2012.......I cannot wait!!!!!
