Answer: People have fewer occasions to reevaluate their beliefs based on new information that challenges their views.
Explanation:
Some people are concerned about the online echo chamber because this does not allow individuals to know differents points of view or to contrast whether their points of view are correct or not.
Online Echo Chamber is a term to refer to the phenomenon in which the mass media echo (widely spread) ideas or beliefs.
One of the characteristics of this phenomenon is that different or competing views are censored, minority represented, and prohibited. This prevents people from confronting their beliefs with others and modifying their "wrong" thoughts.
So the correct answer is "Some people are concerned about the ubiquity of the online echo chamber because this does not allow individuals to know other points of view or to contrast whether their points of view are correct or not".
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