Meaning
An environment, especially in media or social media, where people encounter only opinions and information that repeat and reinforce what they already believe, insulated from challenge or rebuttal. The term describes both the closed information space and, by extension, the community inside it. Usually critical; typically aimed at other people's information diets, rarely one's own. Regional use: General English.
Origin
The phrase began in acoustics for a physical space where sound reverberates, and was borrowed as a metaphor for self-reinforcing media well before the internet: documented examples include David Shaw's 1990 Pulitzer-winning analysis of McMartin trial coverage calling the reporting an 'echo chamber of horrors' and Time's 1998 description of Clinton-Lewinsky coverage ricocheting around a 'media echo chamber'. The concept existed offline but became far more widely used with the rise of online communication and social media in the early 21st century; Jamieson and Cappella's 2008 book Echo Chamber, on conservative talk radio, was the first empirical study. Cass Sunstein's work on republic.com (2001) and #Republic (2017) shaped the debate around the idea, though neither he nor anyone else is documented as coining the metaphor, and its exact first metaphorical use is unknown.
Research Sources
References used to check this entry’s meaning, history, or documented forms.
Variants
- echo chambering
- echo-chamber effect
- liberal/conservative echo chamber
- media echo chamber
Usage Examples
- Living inside a partisan echo chamber, he was genuinely stunned by the election result.
- The platform's recommender system can turn a mild preference into a full echo chamber within weeks.
- Journalists worried the story had bounced around an echo chamber without anyone checking it.