There are a number of categories. I think public accounts--financial-type information, which is published and produced, and which citizens have an interest in--is more or less readily available. It's just another way of publishing. In many respects, it is another way of publishing government information and reports, of which there are a vast number.
Also, a number of data sites are already available. The challenge is that there isn't a clearing house or a consolidated place to get it, so it can be very difficult to find. One of the exercises will undoubtedly be to understand what's already available and how to make it more easily available. The natural resources area is another one where there is potential opportunity for economic spinoff. Those are just a couple of ideas.
As to whether Facebook and other social media sites would be a good way to elicit citizen input, I would certainly think so.