Effects of content communications propagated to users of a social networking system may be tracked and measured by the social networking system. Identifiers of content presented to users within a time period before the users interact with the content are recorded. As users interact with the content, additional data describing the interactions with the content and the users interacting with the content are stored. Various metrics may be determined from the data describing interactions with the content. For example including virality metrics and reach metrics, may be determined and presented to the user that posted the content.