1. A method for populating identities in a message service, the method comprising: registering a user of a first messaging service with a second messaging service; identifying user identities for users other than the registered user, wherein the user identities are associated with the first messaging service and the user identities are stored in a list associated with the registered user; determining if at least one of the identified user identities has a matching user identity associated with the second messaging service; and populating a database associated with the second messaging service with the matching user identities.