As we want to build new ideas here it is only logical that we should have some idea on what to create ideas for.

Post a new challenge here when you know of some problems that exists in the world and solving of which would benefit from a little discussion here. Basically when you have more questions than good answers the topic falls into the category of a challenge. The line between an idea and a challenge is not that clear, Or not yet anyway. "Let's save the world" is kind of a good idea but maybe I would call it a good challenge until we have some more concrete ideas on how to do that.