9. The media of claim 8 , wherein the one or more computing systems comprise a dongle of the social-networking system, the dongle comprising: a first interface operable to communicate with a content source; a second interface operable to communicate with the display device; and one or more transceivers operable to communicate with the social-networking system and the mobile device.
8. One or more computer-readable non-transitory storage media in one or more computing systems, the media embodying logic that is operable when executed to: provide social content for display in a mobile application running on a mobile device of a user of a social-networking system, the mobile application configured to display an interface for selecting media content to view on a display device of the user that is separate from the mobile device, wherein: the social content is determined from a social graph of the social-networking system, the social graph comprising a plurality of nodes and edges connecting the nodes, the nodes and edges comprising: device nodes that each correspond to a respective mobile device; user nodes that are each associated with a particular user of the social-networking system; concept nodes that are each associated with particular media content; and a plurality of ownership edges connecting the user nodes and the device nodes, each particular ownership edge indicating that a particular user corresponding to a particular user node owns a particular device corresponding to a particular device node; the mobile device of the user is determined by analyzing the device nodes and the ownership edges of the social graph; and the interface of the mobile application is configured to display, proximate to each particular media content that is displayed for selection, particular social content that is connected to both the user and the particular media content in the social graph, the particular social content comprising: an identification of at least one friend of the user who has previously liked the particular media content; and an identification of at least one friend of the user who is currently watching the particular media content; receive an indication from the mobile application that an option to view particular media content has been selected by the user using the interface of the mobile application running on the mobile device; and in response to the selection by the user on the mobile device, provide one or more instructions to display the selected particular media content on the display device of the user that is separate from the mobile device.