The greatest exposition of the echo chamber problem comes from this comic:
You can get an insight into the problem we face today where people live in their own 'ideological bubbles' by visiting Red feed blue feed at Wall street Journal
An excellent article that can reveal your own ingroup-outgroup bias is available from I can tolerate anything except the out group
Another example of an echo-chamber effect is what was known as the Steve Jobs Reality Distortion Field:
Reality distortion field (RDF) is a term coined by Bud Tribble at Apple Computer in 1981, to describe company co-founder Steve Jobs's charisma and its effects on the developers working on the Macintosh project.
The common criticism of academia as existing within 'Ivory Towers' is about Echo chambers/Ideological bubbles.
Your echo-chamber, your ideological bubble, your personal RDF -- are all related to your World View. The term 'World View' has been brought into English from the German philosophical concept: Weltanschauung.
Reflections on trusting trust. https://www.schneier.com/blog/archives/2006/01/countering_trus.html