Detect Invisible Users on Yahoo Messenger http://www.raymond.cc/blog/archives/2007/11/19/... In Yahoo Messenger, you can change your status to "Invisible to Everyone" which means everyone will see you as offline but in fact you're online! The invisible feature is really great to avoid people from bugging you. However, this useful feature is now pretty useless because there is a way on how to detect invisible users on Yahoo Messenger.
