We already know who will get rich from the Facebook IPO--Hollywood dramatized that part.

Now the parlor game in Silicon Valley is figuring out exactly how rich they'll become after Facebook lists on the stock market.

The Journal reported that Facebook is hoping to complete a public offering by the second quarter of next year at a valuation of at least $100 billion.

Facebook hasn't disclosed the stakes of its largest owners, though it will have to do so when it files its IPO paperwork. But as the Journal has reported before, CEO Mark Zuckerberg owns about 24% of the company.

The math here is easy: Zuckerberg would be worth $24 billion if Facebook's listing values it at $100 billion.

David Kirkpatrick, who gained extensiveaccess to Facebook's executive team for his 2010 book 'The Facebook Effect,' offered a few estimates in his book. He wrote that co-founder Dustin Moskovitz (who is no longer with the company) owns 6% while spurned co-founder Eduardo Saverin (also no longer with the company) owns 5%. Early executive Sean Parker owns 4%, he said, while early investor Peter Thiel owns 3%.

One mystery among the estimates: Sheryl Sandberg, who joined Facebook as COO in 2008, is also believed to have been granted a small stake in the company.

Many numbers may have shifted--probably downward--as Facebook has diluted the stakes of early owners by issuing stock to new investors such as Goldman Sachs. And some stakeholders have liquidated their shares on the secondary market to fuel their other activities, charitable giving, house purchases, and more.

For those keeping track, a Zuckerberg worth $24 billion would be less rich than Microsoft's Bill Gates and Oracle's Larry Ellison. But he would be more rich than Google co-founders Larry Page and Sergey Brin, according to estimates of their wealth by Forbes.