A social networking website maintains a profile for each user of the website. The profile includes data associated with a user, such as a connection to one or more plurality of other users of the social networking website or user preferences. The social networking website communicates with one or more third-party application servers to provide one or more applications to social networking website users. When a social networking website user requests an application provided by a third-party application server, the social networking website communicates a subset of the user's profile to the third-party application server, allowing the third-party application server to use this profile data to personalize the application performed for the user. A privacy settings associated with a user profile allows the social networking website to limit the profile data communicated to the third-party application server.