15. A system, comprising: one or more memory devices; and a processor communicatively coupled to the one or more memory devices, the processor operable to: access a social graph of a social-networking system, the social graph comprising: user nodes that are each associated with a respective user of the social-networking system; concept nodes that each correspond to a respective device; and a plurality of ownership edges connecting the user nodes and the concept nodes, each particular ownership edge indicating that a particular user corresponding to a particular user node owns a particular device corresponding to a particular concept node; determine from the social graph a device of a user of the social-networking system; determine, from the social graph, media content that a friend or a connection of the user in the social graph is currently viewing; and provide the media content that the friend or the connection of the user is currently viewing for display on the device of the user.
15. A system, comprising: one or more memory devices; and a processor communicatively coupled to the one or more memory devices, the processor operable to: access a social graph of a social-networking system, the social graph comprising: user nodes that are each associated with a respective user of the social-networking system; concept nodes that each correspond to a respective device; and a plurality of ownership edges connecting the user nodes and the concept nodes, each particular ownership edge indicating that a particular user corresponding to a particular user node owns a particular device corresponding to a particular concept node; determine from the social graph a device of a user of the social-networking system; determine, from the social graph, media content that a friend or a connection of the user in the social graph is currently viewing; and provide the media content that the friend or the connection of the user is currently viewing for display on the device of the user. 16. The system of claim 15 , wherein providing media content for display to the device of the user comprises streaming media to the device of the user from a device of another user of the social-networking system.