The latest iteration of Facebook's S-1 filing is out.
According to CNBC, Zuckerberg will be selling 30.2 million
shares, which means that at the top of the range we're looking
at an instant sale of about $1 billion.  The specific line in
the filing is:  In connection with our initial public offering,
Mr. Zuckerberg will exercise this stock option with respect to
60,000,000 shares of Class B common stock and will then offer
30,200,000 of those shares as Class A common stock in our
initial public offering.  So Zuckerberg will still have a ton of
Facebook stock, and he will control 57.3% of voting share post-
IPO.