As The Economist reports, restating rumours in order to rebut them only helps propagate them further, and worse :
"As information is passed around, important qualifiers are lost. A rumour may start as “I’m not sure if this is true, but I heard that…” Then it evolves into: “I heard that…” Finally it becomes: “Did you know that…?” Even when no one intends to spread falsehoods, they spread.
In several experiments, Mr Rucker and Mr Dubois planted rumours among undergraduates. They found that with each repetition, scepticism diminished. The rumours themselves did not change; only the likelihood that the students would believe them. These findings were published in a report called “The Failure to Transmit Certainty”.
Instead of denying false rumours, a company should put out a stream of positive messages about itself, reckon Mr Rucker and Mr Dubois. This deprives myths of oxygen and also nudges people to doubt nasty things they may hear about the company in question."
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