8. The method of claim 5 , wherein the developed data is inference information developed from data related to members in a given user list and that is known by the non-owner, and wherein the developed data is inferred from data selected from a group comprising similar web sites visited, videos viewed, types of searches conducted, determined related interest categories, determined geographical distribution, or calculated score for a probability to purchase goods or services.
5. The method of claim 1 , wherein the associated metadata includes data developed by a non-owner of the user list data relating to inferences about members included in a user list.