"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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US deprecation of civilised values is a key element in the resurgence of fascist ideology, IMO. They brought it on us all.
Alt right abuse of the term to disparage liberal and democratic values is obviously deluded, but it does have other use cases.