The term "echo chamber" has indeed evolved beyond its original association with audio recording. In the context you're referring to, an "echo chamber" typically describes an environment, such as social media or online communities, where individuals are predominantly exposed to ideas, opinions, or information that align with their existing beliefs or biases. This reinforcement can lead to a narrowing of perspectives and limited exposure to diverse viewpoints.

The metaphorical use of "echo chamber" in this sense gained traction in the late 20th and early 21st centuries, coinciding with the rise of social media platforms and the increasing personalization of online content. It became a way to describe the phenomenon of people being surrounded by like-minded individuals and information that reaffirms their pre-existing beliefs, which can potentially hinder critical thinking and open dialogue.

The term's popularity surged as discussions on the impact of social media algorithms and filter bubbles gained prominence. Nowadays, "echo chamber" is widely used to describe the self-reinforcing information environments that can contribute to polarization and the amplification of certain viewpoints.
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