He was also a wealthy kid with connections. People place far too much weight on execution. Most of it is being in the right place at the right time and having existing connections.

https://www.thecrimson.com/article/2003/11/19/facemash-creat...

https://www.businessinsider.com/how-mark-zuckerberg-hacked-i...

Not what I'd call great execution anyways.