 In a social network game, agents choose from a population of potential opponents; in the version of the IPD that interested Axelrod, agents must play every other member of the population of which they are a part. The original description of the IPD by Dresher and Flood, however, concerned a single pair of players who repeatedly play the same PD game. In a brief, but influential, paper a pair of distinguished physicists, William Press and Freeman Dyson, recently returned attention to this original version of the IPD, or rather to the infinitely repeated version of it.