My Windows Phone uses Facebook contacts to augment my contact list and integrates their Twitter and Facebook updates, shows my Facebook photo albums, and allows

My Windows Phone uses Facebook contacts to augment my contact list and integrates their Twitter and Facebook updates, shows my Facebook photo albums, and allows me to check in or post updates to Facebook and Twitter. I'm sure Android/iOS offer similar functionality. What more could a Facebook phone launched this late in the game really offer other than lock-in?