While it seems like an insurmountable task to persuade people to care about objectivity and information quality, it turns out that the techniques used to provide customized search results are the same ones that allow for mass surveillance on the internet. A nice side effect of becoming more anonymous online is that you'll also get much less of this targeted information. So maybe a push toward making people paranoid would help in releasing people from (some of) this echo chamber phenomenon.
Yea, but the paranoia would only work tangentially. A subject thereof (paranoid agent) would receive less target results, however the operant intention is usually to evade detection. Release from the echo chamber may temporarily break the spell of confirmation bias, however it does not ensure that the subject will take information objectivity-quality to heart. I'm thinking... If instead there was a way to challenge subjects core identity, then they listen. So, the trick would be to show people that by manipulating their search results, you can manipulate their actions, get them to do something they would not otherwise have done.
Targeted results stop you from acting freely.
Some kind of undeniable "before and after" snapshot probably needs to be presented to subject or they will insist ad nauseum that it was their idea all along.