Here is my collusion graph for my daily search in internet, social networks, my emails, watching video on YouTube and checking my Ryerson account.

collusion is secret or illegal conspiracy in order to cheat or deceive others.

Collusion is a name for the Firefox add-on that allows people to see in reality what other sites tracking them as we search in web. after I downloaded collusion and looked at my graph, I realize that it is really scary that we as people do not have any kind of privacy in real world, we upload our private pictures and messages in sites and we have no idea that how many people are tracking us and know that what is going on in our private life! I knew they were ways that hackers could record any of our data but did not know that social networks such as Facebook is also doing that in other way more than just advertising! After surfing in web, I realize that more than 100 third party our watching what I am doing. Cookies help third parties to track information. A cookie is a piece of information in the form of very small text file that is placed on hard drive. They have advantages and disadvantages for users, although the save information and remember them so the user do not need to remember them all the times but they are also used to track our search in web. 
I heard that some bug companies are able to check people's accounts in social networks or so on before they decide to hire the person, now I am sure they do and I should be careful of what I am posting in web as everybody could see.