Does Reciprocal Gratefulness in Twitter Predict Neighborhood Safety?: Comparing 911 Calls Where Users Reside or Use Social Media AM White, L Bai, C Homan, M Funchess, C Cerulli, A Ptah, D Pandita, ... Proceedings of the International AAAI Conference on Web and Social Media 12 (1), 2018 | | 2018 |