Answer:
The Bandwagon Effect
Explanation:
In Psychology this scenario is an example of The Bandwagon Effect. This is basically the effect that occurs when a group of individuals all state the same information. Regardless of whether or not the information is actually true, it still causes most individuals hearing the information to agree with it or change their minds if they previously did not agree with it. This is a cognitive bias which is mainly the result of peer pressure and/or wanting to be accepted.
