There is a fundamental conflict of interests in asking for new information from a diverse cross section of people (aka the web) while also wanting to only see those things with which you already agree.

If your purpose is knowledge or worldly depth/breadth, there is probably greater value in doing exactly the opposite. You know best those things which you already like.. so exposure to those ideas you don't already like would provide the greatest bang for the cognitive buck.

If anything, we need less filters. (imo)