Multifaceted Nature of Social Media Content Propagating COVID-19 Vaccine Hesitancy: Ukrainian Case. - Olena Zakharchenko; Roksolana Avramenko; Artem Zakharchenko; Anastasiya Korobchuk; Solomiia Fedushko; Yuriy Syerov; Olha Trach (EUSPN/ICTH, 2021)