By using Facebook Invisible Detector you can
see who is online or
invisible (disabled chat) on Facebook while
you are not in Facebook or your Facebook
chat is off. and get instant sound alarms
when your specific friends get online or invisible.
* This application use a heuristic algorithm to detect invisible friends on Facebook by monitoring activity of your friends (Posts , Comments or likes ) and notify you when somebody use Facebook in offline mode .
* If you are first time using this application you must connect it to your Facebook account . you will be redirected to Facebook to do this automatically .