What I want out of app.net would be a community building machine -- like most web forums used to be. In 2012, I don't know anyone personally that follows a classic forum anymore; I want that type of connection without the archaic style. Building community on my own website, Facebook, YouTube, Reddit, and/or Twitter can be exhausting, tedious, and time consuming. If app.net let me create a community and interact easily so that I can focus on producing content, I'd love it.
Just my two cents.