It's helpful to me, always there ideas in my head to be put on paper virtual note. But privacy is another important aspect, if there is no privacy I doubt that people leave their ideas on your site. You must make clear that. A small suggestion. The logo is very simple and the color of letters "pipe" does not contrast with white background I would add two sections: How to Use and Privacy Policy. Good luck with your site!
You might want to take a look at quirky.com and see if it gives you some ideas, at least as far as group brainstorming works for them, and the IP issues it creates.