Check Who is invisible on Gtalk

Here is a very simple way to find out who is invisible on Gtalk/Gmail .
A few steps are given below with sample pics for better understanding.
Step 1:
Start the chat with the user whose status you want to find out.
Step 2:
Goto to options and click the option "Go off the record". See the pic.


Step 3:
Now send some message to the user. If the user is offline you will get a message in red colour as shown in the pic.



If the user is invisible no red coloured message will be there as shown in pic.



Small catch is that you have to set the chat to off the record when the user is online.
So enjoiii ,use this method and find out who among your friends are invisible.

Any comments on this topic are welcome.