As web companies strive to tailor their services (including news and search results) to our personal tastes, there's a dangerous unintended consequence: We get trapped in a "filter bubble" and don't get exposed to information that could challenge or broaden our knowledge.


http://www.ted.com/talks/lang/eng/eli_pariser_beware_online_filter_bubbles.html[/url]

Even youtube has changed a lot in this aspect.