Stunning talk, just nine minutes long, whose key message is embodied by comparing two peoples' searches on one word: Egypt.

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 worldview. Eli Pariser argues powerfully that this will ultimately prove to be bad for us and bad for democracy.

The best use you'll make of nine minutes today. (Thanks @ocoonassa, from the discussion about Google's Dafari hacking.)