Know If Your Yahoo Messenger Buddy is Really Offline or Invisible?
Yahoo Messenger provides users with the ability to remain invisible even when they are online. Staying so they can know if other users in their contact list are online and can also chat with them.
Now, if you have someone in your contact list that is always offline and if you have some doubts about them, here’s an online service that will help you know the truth.
YDetector is a free online service that is able to detect if a Yahoo Messenger user is actually offline or just in invisible mode.