The article has information about what items stay around even after they are deleted. Like Messages. Pretty scary huh?
The steps to find out what Facebook stores about you are:
Here are the steps on how you can request your personal data from Facebook:
1. Open this site: https://www.facebook.com/help/contact.php?show_form=data_requests
2. Enter your personal information
3. Make a reference to the following law:
"Section 4 DPA + Art. 12 Directive 95/46/EG"
4. Click on “Send”