Zuckerberg gets richer, Twitter gets tougher, flying gets tighter
SFGate -

Number of the day

$81.6 billion

That's the net worth of Facebook CEO Mark Zuckerberg, who has overtaken Warren Buffett to become the world's third-richest person, according to the Bloomberg Billionaires Index. Zuckerberg now trails only Amazon.com CEO Jeff Bezos and Microsoft co-founder Bill Gates. It's a regular Mount Richmore.

Twitter gets tougher


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