Using Natural Language Processing to Mine Multiple Perspectives from Social Media and Scientific Literature

To my mother, my wife, and my adorable daughters ii ACKNOWLEDGEMENTS First and foremost, all praise and thanks are due to God for giving me the power to believe in my passion and pursue my dreams. I could never have finished this dissertation without the faith I have in Him. I am heartily thankful to my advisor, Professor Dragomir Radev for his splendid guidance and encouragement during the course of my studies. His support and insightful advice were crucial to my academic success and my development as a researcher. I am also grateful to Steven Abney, Eytan Adar, Qiaozhu Mei, and Emily Provost for serving on my dissertation committee and for providing constructive comments that made this dissertation better. I was fortunate to collaborate and discuss research with brilliant researchers at the Computational Linguistics and Information Retrieval (CLAIR) group at the univer