It sounds like you may be assuming that targeted advertising is the (or the main) reason filter bubbles exist. I claim that there's a more fundamental reason, n

It sounds like you may be assuming that targeted advertising is the (or the main) reason filter bubbles exist. I claim that there's a more fundamental reason, namely the fact that most people don't like hearing facts or opinions that contradict their worldview. To be sure, targeted advertising definitely supports filter bubbles, but I contend that even without any targeted advertising, if you give people a choice about what information they consume and a sufficient variety of sources from which to choose, they will end up effectively creating their own filter bubbles.