At this particular event he also talked about Google, and how the search engine now taylors it’s listings to the person searching. A liberal person typing in the word “Iran” would come up with completely different listings than a conservative typing in the same search term. He warned that this trend is dangerous as it will cause those seeking information to only see a reflection of themselves rather than information that challenges their beliefs.
There is an interesting Ted talk about this problem:
Eli Pariser: Beware online “filter bubbles” (Not sure how to embed videos any more)
At least with Google, you can turn off personal filtering (from comments section of the video)