Website Net Worth and Reality?

Suppose, Zuckerberg wanted to sell Facebook, the site which is worth 30,000,000,000$.. will he be able to walk away with all the money? Or will he only be able to get all the money if he sold it step by step? ( like how they sold 1.6% for 250 million $ )

Will the supply and demand theory come and reduce the value of the site when it is sold all together in bulk?

My question is not specifically aimed at facebook.. but it just served as an example.

Thanks
 
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