Anyway, let me attempt to convey my general point again: The way I see it there are exactly 2 basic ways advancing. Nepotism, and combinations of luck/hardwork/getting noticed.
I don't know anyone who suggests that there is a glass ceiling preventing women from taking advantage of nepotism. Rather, every explanation of the glass ceiling theory that I have had presented to me boils down to in some way: luck/hardwork/getting noticed doesn't work for women.
Sandberg worked hard, got noticed, and arguably got a little lucky. Bypassing the glass ceiling would be to utilize nepotism but she went clear through it.
Perhaps it does exist, but Sandberg shows it's certainly not impermeable.
edit: s/wall/ceiling/
As I think about it a bit more, I disagree. Luck/hard work/getting noticed by definition really isn't about anything other than merit and luck, so if a glass ceiling exists it has to be related to nepotism.
What about family businesses being taken over more often by sons than daughters? Parents using connections to find their son a job, and find their daughter a husband?