Originally Posted by Killswitch

Serious question, why won't you sign an NDA/NC before hearing the ideas? Even if it's something as dumb as cloning Facebook, it reassures the idea man that you're serious and aren't just trying to screw him out of his idea. It doesn't hurt you if you don't like the ideas...

By refusing to sign one is a red flag big time. Doesn't matter if it's from a user on GFY or Angel.co. Anybody who's serious will want these documents signed, whether you like it or not.