"user communities" . . . "Virtual community" . . . . "community site" . . . "Online communities" . "online community" . "Virtual Communities Group" . "internet community" . "online mobilization" . . "share and discussion sites" . "user community" . . "connect professionals" . "on-line communities" . . . . "virtual collaborative community" . "Online Community" . "interactive online communities" . . . "virtual space" . . "Online community service" . "collaborative project" . "online book community" . . . . "communities" . . . "Virtual_community" . "Community website" . . "Internet community" . . . "online communities" . "virtual community" . . "online societies" . . "community websites" . . "Virtual community" . "virtual communities" . . . . "virtual societies" . "community" . . "online culture" . . "digital community" . "disconnected sub-groups" . "Benchmark virtual communities" . "e-communities" . "online presence" . . . . . "virtual community culture" . "Additional virtual community listings" . "virtual web community" . . . "collaborative community project" . "virtual" . . . . . .