A very interesting Ted talk. We all know internet controlling goes on! But this explains it very well. It’s very interesting to try googling on friends computer and getting different results, try it!
Personally I use Ixquick as my search engine which does not record your details. I also don’t use Facebook (anymore, i’ve been clean for a year now :-)). I do however read the papers online and wonder how much they tailor my viewing. It’s a scary through. I really like this talks description of how we are effectively in the same situation as 1915.