As we continue to test a slightly earlier version of Windows Phone 7, it’s apparent that while the Facebook integration is well done, most people won’t appreciate having their Facebook contacts mixed with their main address book. It turns out that in the RTM version of Windows Phone 7, there is a new filter that will compare your Facebook contacts with your address book. If there is a positive match, the phone will show you updates, pictures, and other bits as it pertains to the contact in question. If there is no match, there will be no intermingling. Nice!