First of all, thanks for the overwhelming response. There were lots of suggestions and nearly all of them have been implemented.
1. Responsive design - Enjoy FS on your mobile and tablets! 2. No Sign-up required 3. Pretty, Google-friendly URL's 4. Social Sharing 5. Option to edit and delete opinions 6. Live Preview
Coming weeks will see lots of new features! Stay tuned! - http://functionspace.org :)