There is no secret - of course Facebook shares information with the applications its' users installed, the users agree to grant access to the applications every time they add one. At what point does personal responsibility become part of the equation? How many times does Facebook or any other system for that matter, have to ask you if you're *sure* you want to let people know that your favorite color is green. And honestly, does it really matter that much?
Facebook doesn't share any of you're legitimately sensitive information with the applications i.e. phone number, IM contact information, email address, etc... Furthermore, Facebook applications are only allowed to store a very limited amount of anonymized information (IDs that require users' permission to be exchanged for associated data) about their users for a limited time and are required by the TOS to delete it if the user removes the app.