Abstract: A referral information communication and management method, apparatus and system, with related computer-readable media, signals, data-structures and program codes, involving, in response to signals received from respective client computers associated with a referrer and referee of a referral from the referrer to the referee: (1) storing information pertaining to the referral in a database as a collection of linked information units, the information units including a referrer identifier identifying the referrer as originator of the information and a referee identifier identifying the referee as intended recipient of the information, the collection representing the referral and being accessible by the respective client computers; (2) identifying collections of information units that satisfy a criterion, and displaying corresponding identifications at one of the client computers; (3) causing at least one information unit in a collection corresponding to a displayed identification, to be displayed at the client c