techcrunch has written an interesting story about a mobile social app called limejuice.
"Using your phone to create or enhance real world interactions is a killer application, but no one has cracked the nut yet. The reason is that the network is useless until it achieves a critical mass of users who are online and using the application via their mobile phone. If no one else is online, there’s little point in you being online, either. And presence detection is another (technical) problem. Even if people have joined the network, how do you know when they are near you?
But once it does happen, look out. You could be in a bar and see who’s single, who thinks you’re cute, who wants to talk to you, etc. (if they choose to share that information). Forget meeting via an online dating site and then organizing an awkward in person meeting that usually falls flat. Instead, you can do the online an real world thing simultaneously."
i went to OpenCoffeeClub (found via upcoming) last week and of the various topics discussed, the android platform and mobile social networks got the most excitement by far.