I just watched this TED Talk and found it very interesting, basically
highlighting how web companies customize services for us with the result
that we are trapped in a "filter bubble" and don't get exposed to the same
information.
http://www.youtube.com/user/TEDtalksDirector?blend=3&ob=5#p/u/0/B8ofWFx525s

I sometimes realized while on the phone googling with someone that we got
different first links, but I discounted it that I was searching from a linux
box.

I was surprised to see how two different people, based on their interests,
got dramatically different results about Egypt when the protests were going
on (for some the protests didn't even show up!)  (at 2:38)