"First, Facebook insiders chose to sell a ridiculous amount of their shares relative to the last major Internet-related IPO, Google. When Google went public, insiders dumped 28% of their shares. Facebook insiders, on the other hand, sold 57% of their shares on Friday."
Comparing two data points isn't exactly rigorous argument. Maybe 28% is low for Google. What is the average? An actual article on this would be interesting. A paragraph in some dude's blog? Pointless.
And really, the correct phrasing should be: "57% of the Facebook stock being offered in the IPO is coming from insiders selling shares."