1. A method for facilitating recommending information by users within a computer social network, comprising: building for a user a recommendation list comprising at least one two-tuple, wherein each two-tuple comprises a target user name and information item; and ranking the recommendation list by using two-tuples in the recommendation list as basic units, such that, by selecting a two-tuple in the recommendation list, the user can recommend a corresponding information item to a user represented by a target user name.