Imagine the stock options she must be getting. same way Meg Whitman became a billionaire running ebay as CEO.
Google is facing what microsoft faced few years ago, lot of their talent switched to google, now they are going to facebook. Real talent always like to move to something fun and exciting.
If you really look closely, google hasn't dont anything fun and exciting lately. They are busy doing the same thing everyone else is doing or buying things. Its good for their pocket, but not fun for the the n3rds
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