In one embodiment, a method includes receiving from multiple client devices real time click-stream data indicative of multiple users accessing a content object within a structured document displayed as a web page and storing presence information associated with each of the users in a server associated with a social-networking system. The method also includes identifying one or more of the users based on the presence information, where each of the identified users accessed the content object within a specified time period and the identified users are within a specified degree of separation from each other on the social-networking system. The method further includes sending, to the client device associated with a first user of the identified users, instructions to modify a representation of the web page to include a messaging interface including presence information associated with one or more second users of the identified users.