Its funny. You sign an NDA and you can't discuss your game experiences from the POV of the rules, although you can probably post in broad swaths, as long as those broad swaths avoid anything rule like.
Heck, I'm not even sure if you can discuss the name of the game covered by the NDA, but if I say I'm playing in a game covered by an NDA, it should be an easy guess.
Hmmm... I can't even tell you if the game plays well. Can I even tell you who my GM is? Probably not.
Alright, how about the Google+ Hangout with battle grid and dice roller? That works extremely well, independent of system. Still in beta and not released upon the masses, but no NDA there. Last night the game broke down into pure silliness. The same silliness that would occasionally break open in a session of my face to face games. It means the group has bonded. We are comfortable enough to let our hair down, so to speak.
So, Dragons For Dinner will be a great tool within Google+ Hangout for RPG sessions once it's fully tweaked. We can see the potential, and it is real. As for the thing behind the NDA? I can't say. No, really, I can't say. Says so in the NDA.