This study looks to prove the meta hypothesis that corrective messages delivered across social media platforms can lead to greater persuasive outcomes than same messages delivered by a single social media platform. The study used 251 undergraduate students for the participant group. The participants took a pretest measuring their attitudes towards vaccinations, then participants were put into either the single-platform or cross-platform condition. The single-platform group read 3 corrective messages shown on either Facebook, Twitter, or Instagram. The cross-platform group read 3 corrective messages shown on Facebook, Twitter, and Instagram. Then participants had to take a post-test measuring their attitudes towards the messages and vaccinations. Variables such as popularity perception, perceived message credibility, perceived message quality, perceived value, perceived descriptive norm, perceived injunctive norm, vaccination certainty judgements, and manipulation check were measured.