Separating Fact from Fear: Tracking Flu Infections on Twitter Alex Lamb author Michael J Paul author Mark Dredze author 2013-06 text Proceedings of the 2013 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies Lucy Vanderwende editor Hal Daumé III editor Katrin Kirchhoff editor Association for Computational Linguistics Atlanta, Georgia conference publication lamb-etal-2013-separating https://aclanthology.org/N13-1097/ 2013-06 789 795