Any website that you create an account on has a "terms of service" agreement. Think about all of the websites you participate in: how many terms of service agreements have you actually read? If you are like most people, you have checked the little box next to “I have read and agree to the Terms” without reading them. These pages are often very difficult to understand; but you can give up some rights when you click on those agreements.
Enter the Terms of Service;Didn't read project, which "...aims at creating a transparent and peer-reviewed process to rate and analyse Terms of Service and Privacy Policies in order to create a rating from Class A to Class E."
Class E is the lowest rating. Go to the site and see what services have red (Class E) icons. Skype, Steam, Twitpic all have them.
This site is an excellent resource for learning about your data rights and how these policies violate your privacy. You can see any number of websites that have been evaluated.