Mark Zuckerberg The $20 Billion Smile

5/18/2012 2:35 PM PDT

Mark Zuckerberg -- The $20 Billion Smile

So this what it looks like to make $20 BILLION in one day.

28-year-old Facebook founder Mark Zuckerberg surfaced moments ago outside his home in Palo Alto, CA -- just hours after his Facebook IPO earned him an extra $20 billion -- and he looked happier (and richer) than ever.

But everyone else wasn't so lucky -- Facebook's stock was originally priced at $38 and finished the day at $38.23 ... not bad, but not great either.

To put it in perspective, Google's stock was priced at $85 during its IPO in 2004, and finished its first day at $100.34.