Seed allows you to store and validate your ideas. You can browse through the seed feed to give feedback to other users' ideas.
I enjoy surfing your feed in order to scout for interesting ideas or find something that would spark a little brainstorming session in my mind. One thing you could do is think about the privacy of the idea. What gives the maker/thinker the trust that his/her idea won't be stolen if it is a good one? Even if the maker recognizes the threat when posting, some kind of an NDA functionality or similar should be implemented. Also you can think about privding a way for people to contact the publisher of the idea to facilitate finding co-founders or people who would offer to work on the same idea.
Great place submit for feedback or surf for interesting ideas!
Will need more testing but maybe privacy for ideas and UX?