api - How can I predict which Facebook friends chat with each other based off online status and Facebook's "last time active" feature -

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if @ facebook's chat (http://i.imgur.com/hxhjehc.png) can see says last time specified user active.

so if 2 friends both last active 2 minutes ago , both go online , become inactive again, there high likelihood chatting.

i want know if has idea best way go accessing data be. don't think it's available through facebook api unsure.

furthermore, perform sort of probabilistic statistical analysis on data see how confident algorithm guess of whether or not 2 friends chatting.

i know question broad ideas on either acquiring data or design , analysis of data appreciated.

this not available via graph api, don't see chance here implement planning.


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