Actually, some other Facebook users have pointed out it tracks the friends that you interact with the most, and not so much who is stalking you the most. Also, the order may be jumbled and are not of significance. A friend mentioned it is probably just a random list of the people you chat with in your chat box. Some said it could be the people whom YOU are stalking the most yourself. I am not a coder so I cannot verify any of this. Any one can solve the mystery?
Anyway, this is something harmless and REAL on Facebook that you can play with on your own without having to give access to third party developers to spam your Facebook account or intrude your privacy.
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