where is the open source idea collection?

I´ve been searching on the web for cool ideas for socially innovative projects, but did not really find anything. How come? There should be a simple list of ideas, open for everybody to take inspiration from or simply put one in action. Or do my searching skills just suck?
A simple list with the topic of: what concretely needs to be changed in my environment. Then anybody could go anywhere and do a project on such an issue. Anywhere in the world, but being sure that there is a real issue he/she is working on. Saves you a lot of research.