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: How did you first hear of the news that Osama bin Laden had been killed? Share your thoughts below.  Responser: I found out when I turned on WBZ-AM when I got up @4:30am
