For starters, micro-app might be what you're preferring to call it, but as a reader (even with a tech background), I couldnt understand what it meant. I think you should put the use cases way up top on the page -- and probably provide one elaborate use case to help the reader better understand. Plus, i think the description needs to be completely reworded: 'Engage with your fans and users by creating micro-apps that allow you to interact in a much richer way than tweets, ads, or email' gives me no insight into what it does and how.