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Re:Edward Snowden on The Joe Rogan Experience [video] by john-radio on Wednesday October 23, 2019 @10:56AM (#21335257)
An echo chamber is a place where the local acoustics make it difficult to speak clearly.

Medical science is able to speak with brilliant clarity hard-earned from centuries of experimentation on the topic of heart disease.

If I hear a discourse involving a cardiologist and a layperson, and it's not really made apparent who is the expert and who is not, then I call that an echo chamber.

Re:Edward Snowden on The Joe Rogan Experience [video] by Ajedi32 on Wednesday October 23, 2019 @11:07AM (#21335371)
That's not the conventional definition of a metaphorical echo chamber.

> 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 ideas are not considered

Source: https://www.lexico.com/en/definition/echo_chamber