Mark Pincus, founder of @Zynga, on "proven, better, new," the product framework that was Zynga's religion: 1. Proven: start with what 10/10 existing users of a category already love, and don't change it. "You do not have the right to change proven. You have not taken enough time to change proven. It is an art that we do not completely understand." 2. Better: only add what 10/10 users agree is better. "For Zynga Poker, better was no download. That was it. Turns out you lose half your users…