Link your Twitter account to your Facebook account to post your tweets and retweets on your Timeline or Page automatically. The Twitter for Facebook app doesn’t post replies and direct messages on your Timeline and can’t change your Facebook status. You can change the privacy settings of the Twitter app on Facebook to limit who sees your tweets and retweets. If you unlink the two accounts, you can delete all your Twitter activity from the Timeline.
Open the Twitter Applications page (link in Resources),
Click the "Connect to Facebook" button, log in to your Facebook account -- if you are not already logged in -- and follow the instructions in the new browser window to link the accounts.
To link Twitter to a Facebook page, click the "Allow" link in the Facebook Connect section of the Applications page.
Check the "post to my Facebook page" box and select the page from the drop-down menu.