There is an easy application offered by Facebook to link to a Twitter account. It allows for seamless updates when you post to the Facebook Fan Page to appear in the Twitter stream. The requirements are that you are the administrator of a Facebook Fan page and a Twitter account.
After logging into your Facebook account, use this link: http://www.facebook.com/twitter/ This should bring up a screen that shows the Pages you administer.
Facebook To Twitter
It should bring up the following screen:
Facebook To Twitter
Now all you have to do is enter your Twitter account information and you will be all set. Now, whenever you post anything to your Facebook Fan Page, it will automatically update Twitter.
Hope this helps!
Facebook
Twitter