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What I see promising is to take the generic social networks concept and apply it around social objects that are suited to the mobile. This is make it easier to come up with mobile viral apps. For example, one big thing I notice in Japan is girls buying all sorts of accessories and makeup. It make sense to have a mobile network that focuses on this target group. We can then design viral apps that are relevant for the group. For example, one that enable friends to share their new accessories, nail polish, make up et al via images that they can capture on their phone.
I will share more about mobile social networks on I get home to do more research. If you have any feedback or comments, do free feel to drop me a note.