This didn't work for me. After I got the e-mail from TRUSTe acknowledging that this was a valid privacy concern, I just got another e-mail from Facebook with more of the same, with some cynical "we do this so you have full control:"

"Unfortunately, since the information and content you upload is often stored
in many different places, there's no easy way to remove it all at once.
Keep in mind, however, that Facebook will never use your information as long
as your account is deactivated. In addition, as your account remains
inactive, this information will eventually be overwritten by other active
users' information.

We require users to delete this information themselves so that they have
complete control over what gets removed. If you still want your account
cleared, please log in and delete any content or information you don't want
stored before deactivating. Once you've done this, let us know, and we'll
remove your login email from our system. We apologize for any inconvenience
this may cause."

Then an e-mail from TRUSTe: "Thank you for the recent Watchdog you submitted against www.facebook.com. The
Web site has cooperated with TRUSTe and has responded to your complaint below.
We are therefore closing this Watchdog. [...]"

Well, maybe they cooperated with TRUSTe; certainly they didn't cooperate with me.