>Also, Facebook users have opted in to Facebook, and its data storage "tactics"

Not always.

Facebook stores data of people that are not even members, using tricks to make their real-world friends submit that kind of data. Upload you mobile phone contacts, find people from you Gmail address book on Facebook, etc.

So Facebook may well have lots of data about you, even though you do not have an account or any knowledge of that profiling.

(OpFacebook is stupid anyway)