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: We need to protect freedom of speech and our innovation economy. Thanks for standing up to keep Internet open. #NoPIPA  Responser: Amen to that! And thank you! :)
