Official Twitter to Facebook Integration
For a long time now, there has been an official ‘Twitter’ app in Facebook that allowed you to distribute your Facebook status updates to your Twitter account.
It seems the reverse has finally been done now.
An official integration from Twitter to Facebook.
You can setup your Tweets to automatically post to your Facebook account. Login to your Twitter account and goto the following URL: http://twitter.com/settings/profile
At the bottom of the page you will see a Facebook authentication button
This will especially be useful for people who are heavy Twitter users compared to Facebook.