What are some promising, reliable websites for garnering ideas from the public or netizens like crowdsourcing?

Please, I'm committed to undertaking a project, or when least expected, countless of projects in which I shall brainstorm alone first before going to the round table with trusted friends. So I hope that nobody would give some tongue-in-cheek responses to my question. I would like to hear out some wonderful and viable ideas the world would have to proffer so that I could also consider and synthesize things a little bit to make any of my new projects work better through improvements. 

Anyone knows what are some websites that allow users to describe their planned projects and allow users to add ideas, provide reviews, and improve, for free?  


(not referring to crowdfunding; just collecting ideas from people.)

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