Abstract: A computer readable medium, apparatus, system, and method for performing identification (ID) operations using a processor or programmable circuitry are provided. The processor configures ID federations between a federation server and applications. The processor is further configured to receive a first authentication request for authenticating a first user who has been authenticated on a first application among the applications with a first user ID using an ID federation. The processor is also configured to check the first user ID to determine whether the first user is authorized to access information of a second user on a second application and send a second authentication request to a second application, the second authentication request for authenticating the first user with a second user ID, which is associated with the second user, using an ID federation between the federation server and the second application.

Abstract: A method for estimation of information diffusion route on computer mediated communication network. The method includes: generating, by a computing device, a user collection that includes an original user posting original information and one or more users forwarding the original information through the communication network; obtaining a network of users registered by a first user of the one or more users forwarding the original information; selecting one or more candidates potentially referred by the first user from the network of the users registered by the first user based on the user collection; and rating the one or more candidates based on historical information of the one or more candidates and the first user. The present invention also provides a computer system and computer program product.