In particular embodiments, one or more computing devices associated with a third-party system generate a web page comprising one or more references configured to cause a client device to send a request to a web site of a social-networking system to access a user comment, wherein the user comment is associated with content on a third-party web site hosted by the third-party system. The request comprises a first URL that references the web site of the social-networking system, and the first URL comprises a second URL that references the third-party web site and comprises a content identifier for the content, and the request is to cause the web site of the social-networking system to access the user comment in a data store of the social-networking system. The one or more computing devices associated with the third-party system may send the web page to the client device.