Yep. I’ve heard complaints about “filter bubbles” before, but have always found these to be entirely theoretical — not a critique of an actual implemented system. In reality, as <chris_va> says, a “filter bubble” is different from a “viewpoint bubble.”

An example: If our recommendation engine at http://recent.io/ concludes you’re interested in Barack Obama, it will (surprise!) recommend articles about Barack Obama. It doesn’t filter by political viewpoint. You’ll get articles from both lefty sources and right-leaning sources.

Also, of course, we offer “top news” if you prefer!