A social networking system generates socially-relevant stories for a user based on other users (e.g., based on actions taken by other users) to whom the user is connected. These socially-relevant stories, including news stories, social advertisements, etc., may be presented on a web page within a domain of an external system that is different from the domain of the social networking system. When a web page from an external system is requested for a viewing user, the social content about other users who are connected to the viewing user may be provided by the social networking system for that viewing user. This personalized social content may be presented in a frame (e.g., an iframe) of the external web page rendered and provided for display to the viewing user.