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And Facebook spends $5mn on security for its CEO and $1m for its CFO.

I would say that Zuckerberg is much more recognizable than Spiegel. Likely gets mobbed where ever he goes.

You forget to Spiegel is engaged to Miranda Kerr, supermodel and is likely to be super visible outside of work.

$1.3M for its COO (Sheryl Sandberg), not CFO.

True, sloppy copying. I guess the CFO is safe as long as the stock performs well :-)