“Collective prediction” sounds a lot more awkward to my ear than “collective forecasting.” “Collaborative prediction” sounds just as bad. I don’t think most people see much a difference between “forecasting” and “prediction”, other than that, “forecasting” is a word used a lot more often in business contexts. That seems to me a good reason to use “forecasting.”
I am waiting an input from Andrew Gelman —maybe.
By the way, Felix Salmon finds out that I am indeed bi-polar… — 
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NEXT: Predicting = Forecasting –> Collective Forecasting = Collective Intelligence That Predicts
