Yahoo's response to the flaw in invisible settings

Focus of the post:- Yahoo's response to the flaw posted here

from    Yahoo! Messenger <messenger-abuse@cc.yahoo-inc.com>
reply-to    Yahoo! Messenger <messenger-abuse@cc.yahoo-inc.com>
date    Tue, Apr 15, 2008 at 4:42 AM (i am a lazy blogger)
subject    RE: technical vulnerability report (KMM69165525V14715L0KM)
signed-by    cc.yahoo-inc.com
Hello,

Thank you for contacting Yahoo! Messenger.
 
We appreciate you bringing this incident to our attention.  Below you
will find a couple different ways to protect yourself from abuse.

In order to ignore a user, they cannot be on your friends list in
Messenger. So if you have them there you must delete the contact from
your Messenger List in order to ignore them. Your friends list will
supersede your ignore list.

When you ignore a contact, you will always appear to be offline to the
contact. They can never view your status or send you an IM.

There are several different version of Yahoo! Messenger, so make sure
that you follow the instructions for your particular version.

WINDOWS MESSENGER:
  
To ignore a contact:
1. Click the "Messenger" menu in Yahoo! Messenger and select
"Preferences."
 2. Click the "Ignore List" category.
 3. Select the option labeled "Ignore only the people below."
 4. Click the "Add" button.
 5. Enter the Yahoo! ID of the contact you want to ignore.
 6. Click the "Ignore" button.
 7. Click "OK" at the bottom of the window.
 8. You can ignore up to 100 contacts.

NOTE: You can remove a contact from your Ignore List by selecting the
Yahoo! ID and clicking the "Remove" button.

 To ignore anyone who is not on your Messenger List:
  
1. Click the "Messenger" menu in Yahoo! Messenger and select
"Preferences."
 2. Click the "Ignore List" category.
 3. Select the option labeled "Ignore anyone who is not on my Messenger
List."
 4. Click "OK" at the bottom of the window.

MESSENGER FOR THE MAC:

 To ignore a specific user:

 1. Click "Friends" from the menu bar.
 2. Select the "Edit Ignore List" option.
 3. Enter the Yahoo! ID of the person you wish to ignore exactly as it
appears on your screen.
 4. click the "Add" button and then click the "Done" button.

 To ignore anyone who is not on your friend list:

 1. Click "Friends" from the menu bar.
 2. Select the "Edit Ignore List" option.
 3. Enable "Ignore anyone who is not in my Friend List".
 4. Click the "Done" button.

MESSENGER FOR THE WEB:

Yahoo! Messenger for the Web behaves a little bit differently than the
installed client versions of Yahoo! Messenger.  There is currently no
option to ignore everyone who is not on your Messenger List, nor can you
ignore an user before they send you a message.

If you get a message from a person whom you wish to block, simply click
on the "Block" button in the upper right-hand corner of the conversation
window.  You will no longer receive messages from that person.

Thanks again for contacting Yahoo! Customer Care.

Regards,

Yahoo! Customer Care
For assistance with all Yahoo! services please visit:

  http://help.yahoo.com/
Thank you again for contacting Yahoo! Messenger.

The reply doesnt even mention the word invisible it talks about ignoring the user from the friend list.