 The social network games considered above are not really evolutionary PDs in the sense described above. The patterns of interaction evolve, but the strategy profile of the population remains fixed. It is natural to allow both strategies and probabilities of interaction to evolve simultaneously as payoffs are distributed. Whether cooperation or defection (or neither) comes to dominate the population under such conditions depends on a multitude of factors: the values of the payoffs, the initial distribution of strategies, the relative speed of the adjustments in strategy and interaction probabilities, and other properties of those two evolutionary dynamics. Skyrms 2004 contains a general discussion and a number of suggestive examples, but it does not provide (or aim to provide) a comprehensive account of social network PDs or a careful analysis of precise formulations to properly model particular phenomena. Much remains unknown.