| − | An '''echo chamber''' is a hollow enclosure used to echo sounds, primarily used for recording purposes. | + | An '''echo chamber''' is a hollow enclosure used to echo sounds, primarily used for recording purposes. Figuratively, it is a group of people, especially in the [[liberal]] [[media]], who quote only one another and [[Fallacy of invincible ignorance|refuse to consider]] outside information or viewpoints, or a Web site catering to such a group. |