Last March, police in Coralville, Iowa, investigated a bomb threat targeting a junior high school. Authorities brought in specially trained dogs to sniff for explosives and started looking into why someone might try to target the community’s teachers and students. Law enforcement quickly determined that the threat was a hoax. Detective Hanna Dvorak from the Coralville Police Department arrived at a theory. “It appears this all stems from a post made earlier this week by Chaya Raichik and her ‘Libs of TikTok’ account,” Dvorak wrote in a report to her superiors. Raichik, 29, is not accused of making any bomb...