There are also social networks for common things such as diabetes. TuDiabetes.com was started in June and now has over 800 members, and I’m one of them. The growth is because the members depend on each other for support and information sharing.

I’ll bet we see more social networks that are aimed at specific chronic diseases and other things that impact our life in significant ways (widows, parents with ADD children, etc.). We’ll go to these networks to ask questions and to learn, not necessarily to hang out with our friends. And they will see continued success and traffic, though the members will join and leave depending on their life circumstances.

To me each network is different — I use myspace to promote my music, while linkedin to promote my fledging web career. I dont want to share the same content or profile. Once you open up the network access, then they lose their uniqueness — much like why I like to clubhop.

There is multiple issues to address here. One, would be the aggregation of all your social network activities so that you can reduce the time spent on keeping up with your friends. Facebook is attempting to deal with this by allowing other networks’ updates into its system. Two, there is the issue of profile portability. So, if I am already set up on Flickr, or Twitter and I want to sign up for another network, why would I have to re-enter all my information? Is there some microformat that can be employed and recognized to ease that adoption pain. Same goes for migrating or copying all your existing friends into the new network. Third, how do you manage multiple personalities in your social networks? For example, my LinkedIn people may not be the ones I want following me on Twitter. So, my privacy or circle of friends may vary from network to network. If there is a One Anything To Rule Them All, it needs to take that into account as well.

(of course, if i didn’t think so, i wouldn’t work on it.)