This is a great question, and probably the question that Facebook wants to answer by rolling out this experiment. It sounds like some (most?) of M's answers ar

This is a great question, and probably the question that Facebook wants to answer by rolling out this experiment. It sounds like some (most?) of M's answers are provided by humans and/or highly-customized apps. This release could be more of a Wizard of Oz experiment so that they can drill down on use cases and create more effective affordances.