Facebook also has tremendously greater adoption, especially among the non-tech savvy, than MySpace ever had. Don't get me wrong, I don't think there is unalterable inertia here, but at its peak MySpace was constantly broken, had far less adoption, and had far less interesting and integrated ways to collaborate than Facebook has established today. Anyone could have looked at MySpace and said "a smart, driven undergrad could build a system that could beat this on one power-weekend with a bunch of redbull"