What do you think are the best examples of Web-based echo chambers? These are the examples you’d point to if you wanted someone to see what an echo chamber is.
By “echo chamber” I mean a Web site where people with the same beliefs and values hang out, egg each other on, and do not for a moment seriously consider other points of view. If they link to other points of view, it’s to make fun of them. Participating in these sites should make you more close-minded and more impervious to fact-based counter-arguments.
So what are the best, clearest examples you know of?