26. A method comprising: requesting content from a social networking system for rendering on a user device associated with a user of the social networking system, the social networking system storing a social graph comprising a plurality of graph objects interconnected by graph actions, wherein the graph actions having graph action types defined by an entity external to, and independent from, the social networking system to deliver the content on the user device, the content hosted on an external system and the content associated with a graph object, and wherein each of the graph actions represent a relationship between two or more graph objects and each of each of the graph action types define the relationship between the two or more graph objects; receiving the requested content for rendering on the user device, the requested content including an interface including selectable links associated with user interactions on external systems associated with users of the social networking system, the interface associated with a user profile object on the social networking system corresponding to the user associated with the user device; rendering the interface including the selectable links associated with the user interactions on the external systems on the user device, the user interactions comprising graph actions performed on graph objects by users of the social networking system; selecting a link associated with a user interaction on one of the external systems, the link associated with an instruction to the social networking system to send request to the one of the external systems to perform a graph action on a graph object associated with the user interaction on the one of the external systems; receiving from the external system, a delivery of content on the user device associated with the graph action and the graph object responsive to selecting the link; and communicating the graph action performed on the graph object associated with the user interaction to the social networking system, wherein the social networking system updates the social graph based on the graph action performed, and the graph action is of a graph action type that was defined by the entity external to the social networking system.
27. The method of claim 26 , wherein receiving the delivery of content on the user device associated with the graph action and the graph object associated with the user interaction from the external system responsive to selecting the link further comprises: identifying the graph object associated with the user interaction as associated with local content stored on the user device; and viewing the local content on the user device.