One of the new announcements for Windows Phone 8 is that apps are becoming more than just live tiles. Live apps are available and will feature on the Lockscreen as seen in the above screenshot. More apps will be able to show you notifications on the lockscreen, which means you can get more info from glancing at the screen than ever before.
With this new feature, Microsoft has announced a partnership with Facebook in order to get your photos and notifications right on your phone and lockscreen. Twitter has also been updated and a special version for Windows Phone 8 so the notifications are seamless on the lockscreen. With social services that are custom-tailored to Windows Phone 8, this is going to be the best way to experience Facebook and Twitter on a mobile device. Exciting!