Calls to Action on Social Media: Detection, Social Impact, and Censorship Potential Anna Rogers author Olga Kovaleva author Anna Rumshisky author 2019-11 text Proceedings of the Second Workshop on Natural Language Processing for Internet Freedom: Censorship, Disinformation, and Propaganda Anna Feldman editor Giovanni Da San Martino editor Alberto Barrón-Cedeño editor Chris Brew editor Chris Leberknight editor Preslav Nakov editor Association for Computational Linguistics Hong Kong, China conference publication rogers-etal-2019-calls 10.18653/v1/D19-5005 https://aclanthology.org/D19-5005/ 2019-11 36 44