Learn in the textbookDistortions of the Information Environment and Countermeasure Technologies
DefinitionAn echo chamber (エコーチェンバー) is a phenomenon in which like-minded people keep talking to each other on social media and similar services, so the same opinion echoes back, grows stronger, and comes to seem correct or held by the majority.
ExplanationWith fewer chances to hear opposing views, thinking tends to drift toward extremes. The problem is that hearing others say what you already think starts to feel like proof that the opinion is right.
AnalogySpeak in a small walled room and your own voice bounces back at you. Hearing that echo, you assume everyone is saying the same thing.
Memory hook"Echo" is a sound that bounces back, and a "chamber" is a small enclosed room. The name pictures a voice rebounding inside a closed space.