A method of obtaining lists of nodes of a multi-dimensional personal information network includes accessing personal information aggregators from a first set of personal information aggregators that correspond to nodes of the multi-dimensional personal information network that have a degree of separation of one from a first node. One or more lists of additional personal information aggregators that correspond to nodes that have a degree of separation of one with at least one node corresponding to a personal information aggregator in the first set of personal information aggregators are requested. One or more of the requested lists are received and stored.