echo chamber

plural echo chambers

1. A room or other enclosed space that is highly conducive to the production of echoes, particularly one that has been designed and built for this purpose.
2. entertainmentA sound effect that may be applied to live or recorded sounds through a sound editing process, which creates the impression that the sounds originated in an enclosed space which was conducive to producing echoes or echoing.
3. broadlyfigurativelyAn environment in which a person is exposed to only those beliefs and opinions that agree with their own, so that their existing views are magnified and reinforced while alternative ideas are not expressed or considered.

   But it would resound in the conservative media's echo chamber.

   2007, Susan Faludi, The Terror Dream: Fear and Fantasy in Post-9/11 America

   3 more examples

   “What you’re going to end up doing is amplifying within an echo chamber, which is really different from what the movement wants,” said Dana Fisher, a professor of sociology at the University of Maryland whose research focuses on activism.

   2020 March 19, Shola Lawal, quoting Dana Fisher, “Coronavirus Halts Street Protests, but Climate Activists Have a Plan”, in New York Times

   The videos were tailored for the “echo chamber” that is often created by social media networks like YouTube. To keep you watching, YouTube serves up videos similar to those you have watched before.

   2021 April 15, Cade Metz, “Feeding Hate With Video: A Former Alt-Right YouTuber Explains His Methods”, in The New York Times, →ISSN

   But she [Erika Kirk] said that her husband loved a good debate, and she promised attendees that they would hear ideas at the event that they might not agree with. “AmFest is not about echo chambers,” she said.

   2025 December 20, Richard Fausset, Ken Bensinger, quoting Erika Kirk, “Turning Point’s Annual Gathering Turns Into a Gripefest”, in The New York Times, New York, N.Y.: The New York Times Company, →ISSN, →OCLC

   Synonyms: circle jerk, filter bubble, hugbox, mutual admiration society