The PASION (Psychologically Augmented Social Interaction Over Networks) project is designed to research social presence technologies and their effect on individual and group behaviour within mediated collaborative environments. A mobile multiplayer social game called Familiars is being designed, where the success and rank of a player within the game is directly linked to the qualities of the player's in-game social network. By examining the structures of the game-wide social network generated through playing the game, the aim is to identify patterns in the interactions which can be used to direct further studies and build future versions of the game that will enhance the game experience, bringing more of the face-to-face social value to technologically mediated games and hence mediated collaborations in general