On a daily basis we are being tracked by more sites than you can imagine. If you are security and privacy aware you might see a few of these sites. Mozilla added a new Firefox addon to help you track the trackers, Collusion. Here's a talk of Gary Kovacs introducing Collusion.
After this video I gave the addon a try. After installing nothing happened! No diagram was showing. Of course I'm protective of my privacy, so I needed to disable some other addons that help protect my privacy. I use Ghostery and NoScript. Without these privacy protectors Collusion was quickly showing data. Two conclusions can be drawn:
1. Collusion is a nice feature to gain insights in who is tracking you without telling
2. Tools like Ghostery and NoScript do help in protecting your privacy.