Nothing? Do you imply that every app that you can talk about with your friends should implement messaging? From my point of view this is absurd.
By the way, I was not aware you're talking about the app in particular. I don't see much point in having an app for every store I use. What features are implemented in the Bandcamp app which their site doesn't have (and can't have)?
By the way, I was not aware you're talking about the app in particular. I don't see much point in having an app for every store I use. What features are implemented in the Bandcamp app which their site doesn't have (and can't have)?