Consensus cascade
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Consensus cascade is the observed phenomenon whereby one person expresses an opinion, a second person picks up that opinion based on the first person's credibility, and the opinion gathers the weight of consensus without any necessary basis in fact.
References
- JOHN TIERNEY; Diet and Fat: A Severe Case of Mistaken Consensus. http://www.nytimes.com/2007/10/09/science/09tier.html?_r=3