As I mentioned, you wouldn't try to compete with Facebook, since they're the de facto standard. This would be for people who want something different (like Jone

As I mentioned, you wouldn't try to compete with Facebook, since they're the de facto standard. This would be for people who want something different (like Jones Soda). It would likely work best by enhancing the attraction to something existing, like Posterous or like Google's other offerings (including Android). 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.