Gmail Privacy Attack

        You meet an old friend online on Gmail after a long time and you start chatting with that person.. and suddenly he/she says that they got to leave and goes offline...the chat box displays that the person is offline!!!
You are now left in a curiosity to know if that person had really signed out or just invisible!!!!

Heres how you can find out!!

Whenever your friend leaves the chat and goes offline.... put the chat off the record...
This can be done by going under the Actions panel on the right corner of your chat box.

Next after receiving the notice send a message to that person.

After sending a chat message, if it doesn't display anything that means the person is invisible and didn't really sign out!!!

And if the person really signed out of Gmail, then it displays a message "[name] did not receive your chat"...

Note: Do it for fun!!!! Because its not a good thing to snoop around and keep disturbing the person who isn't interested in chatting with you.