Has anyone got an encrypted email from facebook yet? I uploaded my key and ticked the box, but the last notification I got was still in the clear.
If you click that verification link, you'll receive a web notification that it's enabled should start receiving encrypted notifications.
Check your spam folder in case your mail provider's or client's spam filter is mislabeling it.
If you don't see it, try unchecking and rechecking the opt-in box, which should trigger a new verification email. (We've had a feature request for a "Resend" button".)