Facebook's statement on profile tracking:
Facebook does not provide applications or groups with the technical means to allow people to track profile views or see statistics on how often a particular piece of content has been viewed and by whom. If an application claims to provide this functionality, please report the application by going to the application’s About page and clicking "Report Application" at the bottom of the page, or by clicking "Report" at the bottom of any canvas page within the application.
Facebook' statement on unfriending: "Stories will never be published about: ...People you remove from your friends."
You can read more about the scam app for profile tracking here
To get rid of these from a facebook account:
Account>Privacy settings>Apps and websites>You can view the list of apps you have authorized (Click edit)
Also two choices are featured up front:
Remove unwanted spammy appsOR in a worst case scenario you can turn off all platform apps, but then you'll need to reauthorize the ones you want use.
You can also search for specific apps:
Click edit to see what they have access to and make changes as appropriate.