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: This is definitely some of the most impressive skiing I've seen in a long time! Check out @claytonvila in his new edit, 'Five' !! :D vimeo.com/m/110224168  Responser: Adam Rickard Travis Harris
