Invisible-scanner.com is a tool that you can use to check up on your buddies. It shows you if the user is online, offline, invisible, it's avatar and also if it's the main id.
Invisible-scanner.com works no matter what type of Yahoo Messenger client your friend uses. So you will be able to see if your buddy is online no matter that he/she is using official Yaho Messenger or other type of multi-protocol or web-based clients.
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