Google, Facebook, amongst many other sites auto-filter your search results. Although this may be appealing to many people, myself amid a significant percentage of other internet searchers, prefer a myriad of results. Ideally, I want to see both sides of the issue if I am searching for an item in the news. Not just conservative, or not just liberal viewpoints. Or primarily mainstream news sites, as they themselves filter the news.
In this video by TED, you will see how the same search for “Egypt” resulted in quite different results.