If you are at all curious about the invisible flow of on-line information you need to see and hear this TED talk by Eli Pariser. It will make you take a second look at the Internet and your place within the new world it is shaping.
Oh and I should also note that I stumbled across this video in my Facebook feed today. Trust me, after you watch the video this seemingly minor bit of information will become much more than just a personal aside.
