If you were to turn your blog into a Facebook app, what features would it have? What would the UI look like? What are the significant dealbreakers you'd need to satisfy to extend your blog to a social networking platform?
I'm marking this as a community wiki because I'm not looking for one answer, but for an array of "best practices" that developers should consider when taking their blog online through a social network. One feature/UI element/dealbreaking necessity per answer please.