That's why I deleted my actual Facebook account, it really did give me the impression that the company was Cyberstalking me. They knew stuff I did not tell them or put down anywhere in any of the data forms they gave me to fill out. I didn't upload any pictures, I barely did much of anything, yet somehow they seemed to know everything about me anyway.
I eventually made a new "account" a few years later and left it completely blank and filled out nothing but my name... and yet they still guessed quite a few things correctly, including who I knew in real life. So damn creepy. I only use that new account for log in synchronization for games and apps that don't have any other means of access. I wish I could get rid of it too, but it's a necessary evil for certain edge cases.