Facebook's chock full of some incredibly brilliant people, and it hasn't been resting. It's evolving faster as a site than any other web site that large. The "

Facebook's chock full of some incredibly brilliant people, and it hasn't been resting. It's evolving faster as a site than any other web site that large. The "large sites" you're comparing too very well could be large and not evolving because they've found a reasonably successful way to make money and they've honed in on something that works. This may mean that those sites that are still "evolving" have not found success yet.