I cross-post tweets to FB with this app: https://apps.facebook.com/twitter/. I wish it had a way not cross-post everything, i.e. with a #nofb tag, but my volume isn't high enough that that's a concern.
There used to be a nice FB app called Selective Tweets that let you append #fb to tweets you wanted to show up on Facebook, but it doesn't seem to work anymore and seems un-maintained.
