Yes, when I originally wrote the above post I was thinking of precisely PredictonBook, except that it would be crucial that it comes in an app form and almost surely to get a lot of users it has to interface with at least Facebook. I'm not aware that PredictionBook has an app, but I'll check into it. If a donor was looking to donate money to develop such an app, probably PredictionBook is the right place to go and not SIAI as I had suggested before.