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.