Mark Zuckerberg: a Billion Here, a Billion There…

Last year, CNBC's Robert Frank reports, Mark Zuckerberg paid an estimated $1 billion in taxes.

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Facebook's CEO also made last year's biggest charitable donation, giving the Silicon Valley Community Foundation shares worth about $1 billion.

If $1 billion is starting to sound like a routine sum, remember the John Allen Paulos comparison:

A million seconds is less than twelve days.

A billion seconds is almost thirty-two years.