I've never been more confused than when I recently downloaded the Passport app for iOS. I was expecting some kind of basic twitter-like client with some app in

I've never been more confused than when I recently downloaded the Passport app for iOS. I was expecting some kind of basic twitter-like client with some app integration hooks. You know, kind of like what you see when you login to app.net! Instead, I see this really confusing app store, with no explanation. Clicking on an app downloads it, and from there I have no idea why I'd want another app store - maybe these are ADN compatible apps? Maybe they all work together because they're ADN aware? Anyone?