In my opinion, the list of data available is vastly incomplete. Whats the idea with providing loads of social media data from various vendors?
One could definitely use real estate data, commodity data, interest rate data, etc. for regime change measures.
I am not sure if high quality data is free. But as the future unfolds, social media data in my opinion will become quite irrelevant. The firm producing the most alpha should win out. Also, most of these firms offer a premium minute level feed which means most of the numbers being traded on have already been exposed to others before we get them.
This is a weird business where you do nothing to tell people you are accumulating a position, but once you have it promote the hell out of it so others pump up the price.