Are you sure your friend is offline? Well, he can be invisible and cheating on you. DetectInvisible is a service that detects whether Yahoo user is offline or online. You need to enter Yahoo ID of your friend and the service will check for his status.
Though the page is filled with ads, but I particularly like the services it provides, like
– Support of id in the form ..@ymail.com and ..@rocketmail.com too.
– Provision for sending an offline message.
– you can also save your friends avatar on your computer.
– Support all versions of yahoo messenger
DetectInvisible.com, a free service to spy on your friends with a easily rememberable name.