1. A method for tracking information about the activities of users of a social networking system while on another domain, the method comprising: maintaining a profile for each of one or more users of the social networking system, each profile identifying a connection to one or more other users of the social networking system and including information about the user; receiving one or more communications from a third-party website having a different domain than the social network system, each message communicating an action taken by a user of the social networking system on the third-party website; logging the actions taken on the third-party website in the social networking system, each logged action including information about the action; and correlating the logged actions with one or more advertisements presented to the one or more users.