That's true. I can imagine how bad it would hurt to be in Winklevoss' place. But wasting their entire lives suing fb isn't the best course of action. They should forget what happenened and focus on other things and try and make a mark of their own in whatever they're interested.
From a monetary perspective, it seems very profitable and whatever makes them happy.
But if I were in their place i'd rather go out and build something and get known for it than be remembered as someone who kept suing a person just because that guy stole an idea of mine , especially when the guy's already paid me 65 mil.