I think it's ad-hoc location-based social networks. So attendees at a conference would form a social network and share comments, photos, etc. In fact, every pre

I think it's ad-hoc location-based social networks. So attendees at a conference would form a social network and share comments, photos, etc. In fact, every presentation could be it's own mini-network of people in that room. They could sell ad space to the vendors at the conference. They just need to find a killer use case that motivates early adopters to use it. For example, it could be used at colleges to form networks around classes, sports events, parties. This app would be very useful during disasters, but you can't build a business around that. ;-)