Finding Whether Somebody is in Invisible in Yahoo or Not

There is a website www.invisible.ir, which tells the status of any yahoo id. The interesting thing is, even if the user logs in as invisible, it tells the status as Invisible. I don't know why yahoo has not fixed this bug till now. If yahoo thinks it as a feature, then they should rename the status message to something else.

Thanks to Niveditha Samudrala for informing this.