We have long seen echo chambers outside of algorithims back when the word was obscure. The phrase "preaching to the choir" is quite illustrative of this effect

We have long seen echo chambers outside of algorithims back when the word was obscure. The phrase "preaching to the choir" is quite illustrative of this effect as the fringe or extremes select for friendly locales. In addition to that are leaders being surrounded by yes-men and culturally ensuring dissent is hidden.