I have never done this, but a quick web search found this:
FileMaker RSS/Twitter Integration - YouTube which is not in English, but it may spark some ideas for you, and this:
Hope this helps.
Heheh, yea I saw that vid. Didn't help me out much I'm afraid. I'd need to dig around the actual file I think to figure out how they did it.
Sent from my Windows Phone
I think the second link will be more useful to you ;-)
But at least you know it's possible.