Description:

Mark Zuckerberg is a young clever man who is only 26. I think he is a hard-working and mature person. He looks like responsable and strict with himself. Maybe he is nosy too. He seems talkative and polite in the interviews but I'm not sure.
I don't think that he is a big headed or 
lazy man.

Well, he is a blue-eyed tall man who has got fair haired. He's slim and he's got short and curly hair. He's fair skinned too.
He's not really muscular but skinny neither.

Summing up He's a common young american man physically