The line between innovation and duplication is when someone outright copies every aspect of your game, like Zynga did with Dream Heights.
"I don't fucking want innovation," the ex-employee recalls Pincus saying. "You're not smarter than your competitor. Just copy what they do and do it until you get their numbers."
http://www.sfweekly.com/2010-09-08/news/farmvillains/?repost