1. A method comprising: by one or more computer servers associated with a social-networking system, receiving a request from a third-party system to create a social-networking account for a user, the request comprising a unique identifier of the user or a client device associated with the user, the request having been generated in response to a request from the user to access third-party account information from the third-party system; by the one or more computer servers, retrieving user-related information from the third-party system; by the one or more computer servers, generating the social-networking account for the user, the social-networking account comprising a user profile and a user node in a social graph stored by the social-networking system, the social graph comprising a plurality of nodes and a plurality of edges connecting the nodes, each edge representing at least one relationship between a pair of nodes; and by the one or more computer servers, providing social-networking account data to the third-party system.