Prediction Markets Meet Brainstorming

I am a strong believer in the Wisdom of the crowd, and I have been part of good Brainstorming sessions.

I can't but wonder why there is nothing that combines both.

Imagine - for the lack of better term - a social network where someone initiates a query and then everyone else brainstorms around it, pivoting, paralleling, deconstructing, constructive critics... the idea would then be refined and - along the way - additional germinal ideas generated.

Anyone wants to chime in?