Microsoft has released an update for App Social on Windows Phone, but it's not a release that includes new features. Instead, Microsoft has opted to kill the app, removing all functionality and replacing the app experience with a simple redirect to the main Windows Phone app store.
After updating to version 3.15, you'll be greeted by a screen stating that "App Social has changed." Hitting the linked text below that will take you to the Windows Phone Store. We imagine Microsoft is attempting to draw more traffic through its online store (and respective "top" lists and collections), rather than having two destinations that may confuse new users.
There's no real point downloading the app, but we'll include the store link and QR code so you have access to the listing itself.
Thanks to everyone who tipped us!