6. The non-transitory computer readable data storage medium article of manufacture of claim 5 , wherein acquiring the interaction record includes retrieving the community index for a user joining the community of users.
5. The non-transitory computer readable data storage medium article of manufacture of claim 1 , wherein the community index is characterized by a version number, and wherein the synchronizing of the community of users includes acquiring the interaction record at the direction of a peer user based upon the version number of the community index.