An echo chamber would appear to be a derisive term for instances of freedom of association. That being said, it would be nice if "links" to alternate viewpoints could be kept in close proximity to said chambers.
What should bother more people are echo chambers pretending to be open forums. Look no farther than Wikipedia for an ostensibly open community which is in fact an echo chamber allowing no alternate viewpoints; any remark less than fawning for the state of Israel or Judaism is flushed straight down the memory hole and scrubbed off the "Talk" page by an army of Hasbara trolls.
What should bother more people are echo chambers pretending to be open forums. Look no farther than Wikipedia for an ostensibly open community which is in fact an echo chamber allowing no alternate viewpoints; any remark less than fawning for the state of Israel or Judaism is flushed straight down the memory hole and scrubbed off the "Talk" page by an army of Hasbara trolls.