What happens if you've created your account on lots of websites using Facebook Connect, and then one day you decide to completely delete your Facebook account?

I don't mean created a unique account on the site then linked your FBC (and Twitter, etc) to it, I mean actually created the account by registering on the site through FBC.

Do you lose all your accounts on the other websites too, or do they somehow remain even though you didn't create a unique userid, pwd, email for the account on those sites?