By drawing stick figures Dr Lee can bring up a graph showing the spread of the population covered by the study, and then by sketching a battery alongside it she can bring up another chart illustrating how specific groups of people use different amounts of power.

BBC: Microsoft unveils self-sketching whiteboard prototype

Both attempts at digital board-gaming demonstrate how Scrabulous filled a niche by drawing on Facebook's greatest asset--what Zuckerberg calls "the social graph, " the links between users and their friends.

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