This is clear case of survival bias. We had social networks way before facebook, I remember using one in 2002 and it took many years until a mass user exodus to

This is clear case of survival bias. We had social networks way before facebook, I remember using one in 2002 and it took many years until a mass user exodus to facebook. Without hindsight, nothing about facebook was novel. It had less to do with Zuckerberg's intellectual capacity and more to do with luck, capital and network effects.