What a difference two months makes – not to mention an earnings miss. Zuckerberg’s paper fortune has fallen by more than $9 billion since May. He’s now worth around $10.8 billion. His world ranking has fallen to below 72, according to Forbes. He also fell off Bloomberg’s list of 40 richest people.

Does Zuckerberg care? He'd probably say no. He’s trying to change the world, not get rich. But in Silicon Valley, money is a measure – if not the measure.

Dustin Moskovitz – The 28-year-old who helped Zuckerberg found Facebook owned about 133 million shares at last count. Those shares were worth more than $5 billion at the IPO price. Now they’re worth less than $3 billion. So his paper loss is more than $2 billion. It’s less than Zuck’s loss – but losing 40 percent of your wealth matters more when you’re down to your last $2 billion.

Eric Lefkofsky – Lefkofsky invested $1 million with Andrew Mason to launch Groupon. That $1 million stake is now worth more than $830 million. That’s an enviable return. Especially since Lefkofsky already cashed out to the tune of more than $200 million before the IPO.

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