If you’re an avid chatter and suspect that someone is hiding from you (or is in invisible mode), check out this video:

[metacafe]http://www.metacafe.com/watch/478616/how_to_know_if_someone_is_invisible_in_yahoo_messenger/[/metacafe]

Interestingly, YDetector.com automates the process of revealing your contact’s status. All you need to do is input his/her username, and YDetector will do the rest. (Privacy, anyone?)