23. The non-transitory computer readable storage media of claim 20 , wherein the membership based private network comprises an asymmetric service.
23. The non-transitory computer readable storage media of claim 20 , wherein the membership based private network comprises an asymmetric service. 25. The non-transitory computer readable storage media of claim 23 , the asymmetric service further comprising: automatically identifying, by a computer, electronic mail users with an electronic mail address referenced in at least one electronic mail message stored in an electronic mail folder of the first member by data-mining the electronic mail messages within the first member's electronic mail folders for adding the identified electronic mail users to a contact list of the first member, the contact list comprising contact information for a subset of the electronic mail users of the public network; and receiving input from the first member for personalizing an invitation to join the private network, the invitation to join the private network for transmission to the subset of electronic mail users in the first member's contact list.