noun
an environment in which a person encounters only beliefs or opinions that coincide with their own, so that their existing views are reinforced and alternative perspectives are not considered
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The academic community warned about the dangers of falling into an echo chamber of like-minded individuals.
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I try to expose myself to different viewpoints so I don't get stuck in an echo chamber.
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Don't just listen to your friends, you'll end up in an echo chamber.
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Her thoughts bounced around in her mind like echoes in an echo chamber.