I have at times loved to be in invisible mode on Yahoo messenger and chat with people as per my convenience. Last week I was in invisible mode at 7 am in the morning and one window popped up ” Hey Shweta, how are you” . I asked that friend of mine “How do you always know when I am online ? ” . She replied ” xeeber. Its xeeber.com 
” .
I checked out the site and wow you just need to type the user id of the person and xeeber.com tells you the status
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