Sharing networks determined by sharing of items between individuals

A non-transitory computer readable storage medium with instructions stored thereon that, when executed by a computing system, cause the computing system to perform a method for identifying sharing networks, the method comprising:

• receiving selections of items of interest from a plurality of individuals, the items of interest being maintained in a common catalog of items such that common selections relate to the same catalog item;
• saving the items of interest in accounts that are associated with the plurality of individuals;
• recording when an item is shared from one individual to a receiving individual within the plurality of individuals, the receiving individual being provided with an option for accepting the share;
• for each item that is shared, recording the acceptance of the share by the receiving individual if the receiving individual accepts the share via an affirmative assent;
• and
• determining a plurality of sharing networks for the plurality of individuals, each of the sharing networks being determined by identifying all of the receiving individuals who have accepted a share from the individual and all of the sharing individuals who have shared an item that the individual has accepted,
• wherein a sharing network excludes receiving individuals who did not accept a share from the individual and sharing individuals who have shared an item that the individual has not accepted.