Is there a way to change what Twitter reposts onto my Facebook wall?

[Nicholas]

There is a Facebook App called "Selective Tweets." After you install it, whenever you add the hashtag #fb to the end of a tweet, it will post that tweet to your Facebook wall. (The "#fb" will not appear in the Facebook post.) If you don't tag the tweet #fb, it won't post it on your Facebook wall. That way you can choose which Twitter activity is posted onto your Facebook wall.