But I see a major void in the real time social graph.
I use several services to plan what events I wish to go to. And that is another space that could use much better services. I use PlanCast, but PlanCast is not populated enough with events. Users find it too hard to create events, and not enough events get created. And not enough event organizers are using it yet. I also use Charlie O'Donnell's events newsletter.