$19,253,605,209

Facebook began trading on the stock exchange today and that's how much Mark Zuckerberg's shares are worth. That's roughly 641,786,840 hoodie sweatshirts.

And he's not the only billionaire in Facebook-land.  According to CNBC, Facebook co-founder Dustin Moskovitz is sitting on $5.1 billion, former Facebook president Sean Parker has $2.6 billion, co-founder Eduardo Saverin with $2 billion, and Facebook COO Sheryl K. Sandberg owns about $1.5 billion in Facebook stock.

It's funny to imagine how one website that allows people to vent about life and post pictures of fuzzy puppies is now a $100,000,000,000 internet empire.