This is one of those things that is news to me but not other people. Still, just in case I’m not the only one who didn’t realize that Apple’s iTunes App Store has a presence on Facebook, you can find it at either:
I only learned about it because it was listed in the App Store Quick Links sidebar in iTunes.
I don’t see any particular advantage to this Facebook site. It looks aimed specifically for people who literally live on Facebook and don’t go out to see the world outside of Facebook.