Well if your Top 11 account is linked not only with Facebook (FB) but also with either Google+ or Game Center, and you delete your FB account, you will still be able to log in to your Top Eleven account but you will have to do so through mobile due to the nature of the previously mentioned social networks.

If the game account has only been linked with a FB account then deleting the FB account will cause your Top 11 account to become inaccessible. So advise that you link it to G+ or Game Center if you ever wish to delete the FB account.

Which reminds me that I should add this detail to the post I linked to your. Thank you for the question KoRno!