1. A central node comprising: a) a communication interface adapted to communicatively couple the central node to a network; and b) a control system associated with the communication interface and adapted to: i) obtain content information describing digital media content items digitally stored by a plurality of agent devices; ii) store the content information from the plurality of agent devices in a database; iii) receive a request from one of a plurality of requesting nodes including the plurality of agent devices for the content information for one of the plurality of agent devices where the request comprises an identifier of the one of the plurality of agent devices that was obtained by the one of the plurality of requesting nodes from the one of the plurality of agent devices when the one of the plurality of agent devices was within a local wireless coverage area of the one of the plurality of requesting nodes; and iv) provide at least a subset of the content information for the one of the plurality of agent devices to the one of the plurality of requesting nodes in response to the request.