What happens when you add someone who has deactivated their account on facebook?

[Izzy]

He used to be my friend on facebook then he deactivated his account ( and I checked he really did deactivated his account and didn't block me) but then I went through my messages with him and clicked on his name which was now (facebook user) and i clicked add as a friend button.. Now what happened? Will that person get a notification or email since he deactivated his account or what? I don't get why is there an add as a friend button when that person has deactivated his account??!!!!

[sdouble]

Add as friend button will not show up for a deactivated account. It's possible that they deactivated their account, then later reactivated and removed a bunch of friends, including you.

[Tasha]

When an account is deactivated it pretty much doesn't exist. It's impossible to add a person while the account is deactivated. If you saw the add as friend button his account has been activated and you've been deleted

[Vectorash]

You can't add someone that deactivated their profile.

If they deactivated the profile is like they don't exist and never did.