How to know who's online or who's not those not added in our friend list??

I don't really think there is any for Facebook, but then again I could be wrong as I haven't really searched about it. If you do find one, kindly share it here so that we may know. Thanks!

There is no way that you can do that on every person who is not in your friend list.If you are going to find about a specific person,you can see their wall for their updates and the time they have posted or done.If they are online at present,you can see the updates at your present time.But if they just hang out here without much updates in their profile,you cannot find out.

I don't think there is a way. You can't even have contact with some people that is not added on your friends list, depending on their privacy settings. So I don't think there is a way to know if people outside your friends list are online.

I think that is not possible.. you really have to add them as friends first before you can see any of their activities.. That is just the way is it. Why don't you add them as friend?

It's not shared with unknow persons or applications. Maybe there could be an app where all the users who accepts the app could join and see each other online (maybe it exists already).

I also think that there is nothing available for that. But, you can visit the person's time line and have a look whether there is any recent post or not .

There is no any software and add-ons to find who’s online on Facebook.You can’t directly see that who’s online now which are not in your friend list. first of all, You must send a message or post message on that person's wall to chat. if he’s online at that time he will reply back to you. so you can know that he’s online and do chat with him.