How does Facebook application utilize Blackberry push based architecture?

Hi Friends,
I have posted this message in Blackberry Java Development forum. But was told that "if you are not RIM you will not be able to use the push-architecture with BIS". 
Here goes the actual message. Please provide your valuable inputs.
I am developing an Blackberry client application which will be similar to Facebook application for Blackberry.
Since, this application can be  download by any blackberry user who would be subscribed to different BES or BIS, how will the push based architecture of BB work here.
See my previous post 'Push content to devices on different BES' (http://supportforums.blackberry.com/rim/board/message?board.id=java_dev&message.id=3196&jump=true#M3196), which says that push will work through BES.
If that is the case,
How does the FaceBook application for Blackberry work?
Users who download the Fackebook application will definetly not be on the same BES or might be on BIS as well.
Then how will Facebook application receive notificatios and messages instantly using blackberry's push architecture?
(http://www.blackberry.com/news/press/2007/pr-24_10_2007-01.shtml)
Does RIM provide any framework or support for developing facebook like applications which would utilize push architecture irrespective of BES or BIS?
Thanks,
Suresh.

Facebook doesn't use the BlackBerry network, it uses the standard data network.  If you're on BES, that typically is routed through your BES server.  If you're not on a BES, it will use BIS.
I don't believe the application is a "push" application either - it's more likely a real time IM client. 
Jerry

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