On the Reliability and Validity of Detecting Approval of Political Actors in Tweets Indira Sen author Fabian Flöck author Claudia Wagner author 2020-11 text Proceedings of the 2020 Conference on Empirical Methods in Natural Language Processing (EMNLP) Bonnie Webber editor Trevor Cohn editor Yulan He editor Yang Liu editor Association for Computational Linguistics Online conference publication sen-etal-2020-reliability 10.18653/v1/2020.emnlp-main.110 https://aclanthology.org/2020.emnlp-main.110/ 2020-11 1413 1426