Social media behavior is associated with vaccine hesitancy.

Indeed, in this multiple regression, the only remaining significant predictor of hyper-partisan news sharing besides vaccine hesitancy was age, β = 0.21, 95% CI = [0.14, 0.29], P < 0.001, replicating prior work about age and fake news sharing ( 27 ), and affective polarization was a marginally significant predictor, β = 0.08, 95% CI = [0.00, 0.16], P = 0.053 (all other P s > 0.184).

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Since almost 4 billion people use social media worldwide ( 50 ), even small associations between exposure to certain types of online content and vaccine beliefs are practically significant.

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