If you want to find whether Your buddy is online in invisible mode on yahoo or not ,than just go to any of site mentioned below , put yahoo ID in search box and click on search to find the invisible status of your friend
http://invisible-scanner.com/
http://www.invisible.ir
http://ydetector.com/
http://www.imvisible.info/
http://www.yahoo-status.com/
http://www.invisiable.net/
http://www.find-them.net/
http://www.yahoostatus.ro/LightNEasy.php?page=Check%20Status
http://www.buzzu.info
http://www.spy-yahoo.com
http://www.statusdetect.com
http://www.persiangap.com
http://hide.ir
http://detectinvisible.com
http://www.yahoostatus.ro
http://www.inviz.ro
http://www.yahoostatus.org
http://ystatus.com
Have fun
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