Money isn't everything. Mark Zuckerberg may have the highest net worth among his generation of entrepreneurs, but the Facebook CEO only gets 21 out of 294 pages in Sarah Lacy's new Web 2.0 book, Once You're Lucky, Twice You're Good. That's 16 more than his sister, nerd chanteuse Randi Jayne Zuckerberg, which tells us Lacy has her priorities all wrong. The Zuckerbergs' index page: