Ah, Facebook. You want some fun.
I'm not sure how RPX works. I know that he abstracts the details in order to support several social networks.
I got this working using standard Facebook Connect (not RPX). You need to set the user extension to status_update extended resolution . Once you get this, you can post status updates using Users.setStatus.
I recommend looking at the RPX documentation to see if they have something similar.
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