invisible in messenger....how to trck them??

I never knew that. I will also use Buddyspy. Actually few people make themselves unavailable.

there is a software called BUDDYSPY..u can download it from the link http://www.buddy-spy.com/ install it and then you can see all those who are invisible..you will need another account to see them..because both yahoo and buddspy cant be used simaltaneously..you will get signed out from yahoo once you sign in in buddyspy