Kerry Raymond: "A really exciting result would be the ability to predict stock price movements from WP editing behaviour!"
I am actually funded by a project where we are trying that. We have looked a bit on Twitter sentiment (like everyone else is doing), but now also do Wikipedia sentiment analysis for companies.
You see an example here for the Lundbeck pharmaceutical company:
http://rb.imm.dtu.dk/base/c/Lundbeck
The plots are for Wikipedia sentiment through time, Twitter sentiment through time and stock price (plots not aligned temporally).
Lundbeck had bad publicity last year. One of their drugs was, without their acceptance, used for executions in United States. There is a drop in Twitter sentiment in regard to that issue -- and also a slight drop in Wikipedia sentiment. It is unclear to me whether the stock price movement is related to that media issue.
I have not completed the analysis. But you see some further companies here http://rb.imm.dtu.dk/base/c/ Mostly it is only the Swedish and Danish companies I have run through the sentiment analysis.
Finn Årup Nielsen