"Ideological echo chamber " Some people call them shared values. Whether good or bad depends on what they are.
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I agree with the stuff you've added. I'd still say an echo chamber is a very local consensus that can't be ported outside its small borders.
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I remember when to advocate for torture was beyond the pale. I wish I lived in that echo chamber still.
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But as you say, those were *shared values*. Neocon think tanks were the echo chamber. The US betrayed centuries of civil rights work.

