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I think Google could do this entirely with blogger, maybe reader, maybe Picassa, and email, and a bit of code. It would be a huge boon to Android phones. Google groups is broken for some people, and I'd stay away from using it as a building block. Lots of people have negative opinions about Wave, me included. I don't even know if Buzz would help in any of this, the launch was so botched I never looked at it; people h…
As someone who's just removed all my pages, likes, and interests from Facebook -- I just don't think they have my best interests in mind -- a network like this is, of course, a wet dream. But there is a tradeoff between privacy and network effects. The network relies on its members connecting and conversing; that's how the network derives its value. Facebook's network is valuable because it is the de facto online ide…
As for discoverability vs invisibility, you're right, discoverable is more valuable to the network. I think most people would opt for more discoverability than invisibility, but invisibility is a logical setting among a level of settings. And it allows a small group of people who are only interested in staying connected with each other to do only that.