Dynamic enforcement of privacy settings by a social networking system on information shared with an external system

A non-transitory computer-readable storage medium storing instructions, the instructions when executed by a processor causing the processor to:

• interact, by an external system, with a subject user of a social networking system, wherein the social networking system maintains a user account for each of a plurality of users, a user account, social connections of the user, and information describing actions performed by the user;
• send, by the external system, a request to the social networking system for social network information associated with the subject user, the social network information comprising information associated with the user stored in the social networking system, the external system configured to provide an online service to the subject user;
• establish, by the external system with the social networking system, a predetermined time period during which the external system is allowed to use the social network information associated with the subject user of the social networking system and shared by the social networking system with the external system;
• receive a response from the social networking system, the response comprising information responsive to the request for information and one or more privacy settings governing the use of the information, the one or more privacy settings selected by the subject user and specifying rules for access to social network information associated with the subject user, each rule determining whether one or more items of the social network information associated with the subject user are available to one or more other users of the plurality of users;
• use the information from the received response in accordance with the one or more privacy settings;
• and
• responsive to receiving the social network information associated with the subject user, delete, after the predetermined time period, at least a portion of the information associated with the subject user received from the social networking system.