There is a Facebook application called fb2twitter that will automate the process. The application is not fool-proof but it commands a pretty decent user feedback rating. Read up on the user comments if you have any issues.
Here’s another way to do it:
Log into Facebook.
Click this link: http://www.new.facebook.com/minifeed.php?filter=11
You should get a page that looks like this:
On the bottom right-hand side you will see Subscribe to these Stories:
You want to save the address under My Status. That’s the RSS feed information we are going to give to TwitterFeed. So right click on My Status and copy the URL or click My Status and save the URL address from your browser.
Mine looks like this:
Now head over to TwitterFeed and create an account or login (I just used my Google account information to sign in.).
Once signed in to TwitterFeed, create a new feed and you’ll get this screen:
Username and Password? Whatever you use to log into Twitter.
RSS Feed URL? That’s the address we got from Facebook.
Update Frequency? 20 minutes? 60 minutes? How often do you update Facebook?
Prefix each tweet with? Maybe “Via Facebook” or just leave it blank!