Dana Farber and Larry Dignan succinctly state the whole point behind my old Microsoft.com Community Technology Team strategy. Horse, water, drink, whatever.

Identity graph? Yes, but to be clear, it consists of three components; what you know, who you know, and the activities you participate in.

I wonder when they'll start talking about affinity engines? Of course, some smart folks are already working it. As I've been saying, keep an eye on this guy.