Conference on Empirical Methods in Natural Language Processing Proceedings of the Fourth International Workshop on Natural Language Processing for Social Media Socialnlp@emnlp2016 Chairs' Welcome Identifying and Categorizing Disaster-related Tweets Why Do They Leave: Modeling Participation in Online

Annie Louis, Kondrak Greg, Organizers Jane, Yung-jen Hsu, Jane, Zeljko Agic, Hadi Amiri, A. Balahur, Taylor Cassidy, Hai Leong Chieu, Michael Elhadad, Ben-Gurion, H. Escalante, Weizhen Gao, Alastair J. Gill, King, College London, Weiwei Guo, Yahoo Labs, Scott A. Hale, Bo Han, Catherine Havasi, Michael Heilman, Civis Anlytics, G. Hirst, John Henderson, Tuan-Anh Hoang, Wenchin Hsu, A. Sinica, Ruihong Huang, Yangfeng Ji, G. Tech, Jing Jiang, Anders Johannsen, Nobuhiro Kaji, Yahoo, Japan Pallika Corp, Kanani, D. Kim, Suin Kim, J Korea, R. Klinger, Patrik Lambert, Pompeu Fabra, Man Lan, Yu-Ru Lin, Kang Liu, D. Nguyen, Harris Papageorgiou, Athena Rc, M. Paul, Sravana Reddy, Vi Yohei Seki, J. Šnajder, William Yang Wang, Ingmar Weber, Janyce Wiebe, Yi Yang, Yi-Hsuan Yang, Bei Yu, Nicholas Jing Yuan, Microsoft Research, Zhe Zhang, Ibm T J Watson, Hua Zhang, Kevin Stowe, Michael J. Paul, M. Palmer, L. Palen, Ken C. Anderson, Farig Sadeque, Ted Pedersen, T. Solorio, Prasha Shrestha, Nicolas Rey-Villamizar, Amit Navindgi, C. Brun, Cécile Boulard Masson, Scott Nowson, Ben Eisner, Tim Rocktäschel, Isabelle Augenstein, Matko Bosnjak, Sebastian Riedel, Hao Fang, Hao Cheng, Mari, Rui Fang, Armineh Nourbakhsh, Xiaomo Liu, Sameena Shah, Quanzhi Li, Yu-Lun Hsieh, Yung-Chun Chang, Chun-Han Chu, Aaron Jaech, George Mulcaire, Shobhit Hathi, M. Ostendorf, N. A, E. Doggett, Alejandro Cantarero, Steven Bethard, Mark Dredze, Nicholas Andrews, Jay DeYoung, Noah A. Smith, Nikolaos Pappas, Andrei Popescu-Belis, Ken C. Anderson