Getting tons of invites for communities on Google Plus. A limited selection: communities for Digital Culture (look for Ted Newcomb to get an invite), Second Life (288 members already), Second Life Arts (135 members), Opensim Virtual (‘First there was Second Life, then there was Freedom), MetaMeets (3D internet conference), Augmented Reality, 3D printing (1,307 members), Ingress (the Google alternate reality game) (7,193 members) and other Ingress-communities (for the resistance, the enlightened, for various countries…).
Google+ also offers a selection of interesting communities and of course allows you to search for specific interests: fond out more at Google+ communities.
There are discussions about whether the discussion threads should be indexed, tagged (of should we use hashtages), privacy, big corporates, but I definitely have the impression it increases the activity on Google+ and makes it far more valuable.
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