Idea Buddy alternatives

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.