Finding invisible contacts on Yahoo Messenger

Tonnes of softwares and websites and tools are available to check whether your contact on Yahoo messenger is online , offline or invisible ,but i like this one --- > Ydetector.com is a website for Yahoo! Messenger status checking.
With ydetector.com you can now bypass Yahoo! Messenger's Invisible Settings with ease. It's quick and intuitive interface, ydetector.com offers you the ability to see if your friend is truly online or if they are invisible.

You can detect invisible Yahoo! IDs easily with following only 2 steps:

1. Enter your friend’s yahoo ID
2: Click on magnifier.

Wait a few seconds, you will see the status of that ID.