Zynga. Zynga continues to implement Lean with it's products. They don't develop any new feature in any product without concrete proof of user interest. Put up

Zynga. Zynga continues to implement Lean with it's products. They don't develop any new feature in any product without concrete proof of user interest. Put up the "store" sign, make it clickable, if enough users click it, develop the feature. Simple, straight forward, validated.