Here is some turn around for the new Windows Phone 8 Facebook app.
The Tango video calling app for Windows Phone 7 has been updated. The app provides free calls between Windows Phone, Android and iOS phones and tablets, and PCs, and also free international calls to other Tango members.
The app, as of yet, is not available for Windows Phone 8 owners.
Find the app in the Windows Phone Store here.
Thanks Arun for the tip.