Abstract: A method to share challenges between users of a social game system is described. The method may include accessing relationship data reflecting a relationship between a first user and a second user, and accessing challenge data in a challenge database. Based on (1) the challenge data and (2) the relationship between the first user and the second user reflected by the relationship data, the challenge data is selectively communicated as part of a challenge about the first user to the second user, with the challenge forming part of a challenge game.

Abstract: A game machine may facilitate a photographic social game. The photographic social game may be played using, for example, camera-enabled devices (e.g., participating devices). The photographic social game may prompt users of camera-enabled devices to take and submit photographs at a particular time (e.g., 5:00 PM GMT or 5:00 PM local time), after occurrence of a particular event (e.g., 5 minutes after waking up), or any suitable combination thereof. These photos may be assembled by the game machine into a presentation that is shared among the users participating in the photographic social game, and one or more of various games may be played by the users based on the presentation.