About a year ago I started getting emails from facebook recruiters, and guess what my name was resolving to in their system? Yep, that's right -- "DLC Text".
For 6 years they have kept my information even though it was deleted.
A friend of mine ragequit facebook a little less than a year ago, came back, and it allowed him to reactivate his profile. I don't think it ever said 'delete' though.
I really don't agree with this, but I can't deny that there's value in this data. It's unscrupulous to hold onto it, though.
In my opinion, there should be some way to hard-delete information like this, even if the user has to go through some two-key-nuclear-launch confirmation process to prevent accidental deletes.