It searches others, as data is available. Most of the results your getting are from the open source hyve library we have been developing to help manage load and API limits.
http://github.com/Tawlk/hyve . If a service you like is not included, please add it to hyve, and it may well also make its way into our back-end analysis platform.
Well currently it could be used by brand managers to see how popular or unpopular a given topic or person is, or to have an easy way to digest overall stats about the topics social presence.
You could also do things casual like just seeing how people feel about Obama compared to Justin Beiber or android phones or use it while watching a live event to see what people are saying about it. Live results are one of the ways this stack really shines.
As far as where we are going to take the platform, we have some strong ideas ready to implement provided we get the right investment group interested. Lots of things that would be more interesting to those wanting to hire this to do a "job" for them or their company.