I am incrementally a pessimist, but I see the international debate that Edward Snowden has engendered, and I think this is exactly where the discussion should be. So, I would say I'm more optimistic than pessimistic.
This generation has a responsibility to reshape the world. Start the task even if it will not be fulfilled in your lifetime. Even if it seems hopeless now, never give up. Offer a positive vision, with enthusiasm and joy, and an optimistic outlook.