In the 9 minute video TED talk Eli shares his experiences with internet filters which shape the information we are presented with on a daily basis. It does not matter if we are looking at Google or Facebook, the information we get to see - whether it is search results or news - is tailored to what software algorithms think we might want to see based on data collected on our behavior as a user  thus we are always seeing a distorted picture of reality on the web.
Since these computer rules are lacking any form of ethics their choice on what information we are presented with can harm the freedom that the internet was supposed to provide us with and that is central to our society. If any information that makes us feel uncomfortable or that contains a different point of view is edited out, the world we get to see online becomes increasingly distorted and our worldview will neither be challenged nor broadened due to this filtering of information.
In Clive Thompsons article there is a particularly when it comes to current events and news, there is this importance placed on hearing "both sides." I understand that a story is observed from different perspectives, but the fact is that some perspectives are less wrong than others. So, getting more ideas from a group that is consistently getting their information from the less correct analysis is going to get you less accurate information.