Posting to twitter has a language all its own, but for the sake of syncing twitter with Facebook, many of us have had to deal with hashtags and unnecessary fillers when a tweet posts to Facebook. I just recently started using SmartTwitter and it is much better than the default app from Twitter.
You can get to the Facebook App Smart Twitter here
Michael Hoise, the app developer, says:
Smart Twitter was written out of the frustration with the existing Twitter-to-Facebook apps. They either copied everything, or required an arbitrary hashtag to post updates. It should be possible for a computer to figure out which Tweets should be copied to Facebook and which ones should remain on Twitter.