COVID-19 in Bulgarian Social Media: Factuality, Harmfulness, Propaganda, and Framing Preslav Nakov author Firoj Alam author Shaden Shaar author Giovanni Da San Martino author Yifan Zhang author 2021-09 text Proceedings of the International Conference on Recent Advances in Natural Language Processing (RANLP 2021) Ruslan Mitkov editor Galia Angelova editor INCOMA Ltd. Held Online conference publication nakov-etal-2021-covid https://aclanthology.org/2021.ranlp-1.113/ 2021-09 997 1009