I must tell you it sounds logic now…

But like anything else in life – you can find explanations in retrospective easily. Why MySpace is ‘gone’ and facebook is the hottest place?

Lots of reasons that lots of ‘smart’ people will give you long explanations. I guess there is amount of randomness that drove things but people (specially, when they are lucky) doesn’t want to attribute it to the random nature of things. After all, there are so brilliant that it must be something they did. On the other hand, if you fail, then it’s randomness/luck or anything else that take the blame from them.
After thing long intro, here you go for 3min on the three things that were ‘keys’ to Facebook success:

As you can tell, I don’t buy it.