Forget that, the "deactivate profile" function barely works.

I deactivated my profile last Monday. Out of habit, today I went to Facebook from another computer that still had a session cookie. It reactivated my account, no questions asked.

Agreesies. I just logged out today after seeing 3rd party sites being too Facebook aware, and even regular Facebook still thought my session was hot, let alone 3rd party sites who are harder to gauge.