The integration means Twitter fans can now update their streams from within their Facebook profile.
Facebook's "Subscribe for Public Figures" guide has the following:
Yes, soon you'll be able to update your Twitter account directly from Facebook.
To get started:
1) Go to facebook.com/twitter
2) Link your profile or Page to your Twitter account
Once you link your accounts, your Twitter account will be updated every time you post a public update to Facebook.
There has been a similar service for Facebook "Pages" but not for your own personal profile.
Written by: Andre Yoskowitz @ 18 Sep 2011 1:50