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New York (CNN) Terrifying rumors initially propelled by Facebook's algorithms have sparked fears that men driving white vans are kidnapping women all across the United States for sex trafficking and to sell their body parts. While there is no evidence to suggest this is happening, much less on a national, coordinated scale, a series of viral  Facebook   ( FB )  posts created a domino effect that led to the mayor of a major American city  issuing a warning  based on the unsubstantiated claims. The latest online-induced panic shows how viral Facebook posts can stoke paranoia and make people believe that spotting something as common as a white van, can be deemed suspicious and connected to a nationwide cabal. "Don't park near a white van," Baltimore Mayor Bernard "Jack" Young said in a  TV interview on Monday . "Make sure you keep your cellphone in case somebody tries to abduct you." The mayor said he had not been told of the apparent th