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Topic: Center For Countering Digital Hate

Anti-vaccine activists hold signs and chant in front of the Massachusetts State House against Governor Charlie Baker's mandate that all Massachusetts school students enrolled in child care, pre-school, K-12, and post-secondary institutions must receive the flu vaccine this year on August 30, 2020 in Boston, Massachusetts. (Scott Eisen/Getty Images)

How 12 anti-vaxxers steered social media

Matthew Rozsa