Detectinvisible is a free web service that will help you to find out someone is online or offline or invisible on yahoo messenger. No download and sign up is required for using detectinvisible.
To detect one person simply type their yahoo Id in detectinvisible website and click “Go” then you will get their status but also view and download the avatar of any yahoo id. Detectinvisible detector works for Yahoo Messenger (any version), Web Messenger, E-mail, mobile messenger, and any other instant messengers that use the yahoo instant messaging protocol.
The detection process is “quiet” and very quick the yahoo id holder not get any information about the detection. Detectinvisible provide HI5 Finder and Facebook detector it will tell you if a specific id or e-mail has a Hi5 or Facebook account. It also provide backup YM service it help you to maintain your valuable contact list.