It might be useful to have a web-based "loose" community, one I can join and leave with ease, one that's designed from the ground up for loose affinity.
For a real life example, imagine a cocktail party, or better, a great wedding reception. For that evening, I am part of the "community" there. I have "friends" after a fashion, we cluster together, share, and then after that night our community disbands.
We go our separate ways, though sometimes you connect with someone special enough to keep in touch with.
I am not thinking about organizing a web-based loose network around wedding receptions ( but hmm ), I am thinking about the idea of a network that enables and supports other loose social interactions; my stay at a hotel or resort, my cruise, my conference. I've blogged in other places about these ideas, but it seems that Mr. Brogan's post would indicate the idea is becoming more and more visible.
As websites became more and more then norm, it said something very definite about a business or establishment that didn't have one. "Oh... you don't have a website? Hmmmmmm." There might be legitimate reasons for a business not to not have a website, but if you are dealing with the public, selling anything to anyone, or have a message to communicate to others, I can't think of one. I have this suspicion the same thing will happen with social networks.
But not every business or organization has the same social network need. Sometimes your members are transient. Sometimes -you- as creator of the network are transient.
Right now we're in a place where more and more large-scale "permanent" networks are setting up. That's how you build them- to last. To have people come in, and stay. To use a physical world analogy, the whole place is built around the idea of a condo; we build, and you move in, and stay. But what about the space where that's not the best case? What if I need a hotel? or a large tent?
Maybe the idea is that I don't stay for long. The network might last, but my membership is definitely temporary... this is the case for networks centered around a hotel or resort, or around a cruise. Maybe the network itself is not permanent, along with my membership being temporary... conferences, family reunions, and one-time events could benefit from such a loose network.
To enable this, a few things would have to be solved for...
You'd need an easy way to join these networks, or at least a feeling that my investment of adding myself to one is worth the payoff of belonging. If I have to spend 20 minutes to join my hotel's social network, it's probably not going to happen. So to a person with my background in usability and IA, this means I'd need a place to host my "profile" in a more or less permanent and very portable way, that I could just apply to these networks as I saw fit. FoaF and other XML dialects for personal profile storage come to mind.
The revenue model seems obvious; who wouldn't want to be able to advertise to such a targeted group of people? Or maybe, who wouldn't want to be able to sell such targeted advertising?