I'm using twitterberry and it does update it. It has nothing to do with the app. You have to install it on your facebook account instead. Any twitter app will update facebook once you install it on facebook.
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If you can get a Socialscope invite, it handles both Twitter posts and Facebook status updates. Good luck though; it's still in private beta and so it's hard to get an invite.
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I use ubertwitter and it updates both my FB status and my twitter status, but like was said above, you have to connect the two together, on your facebook profile settings. Then you'll be rockin'....
