Rumor has it that Mark Zuckerberg’s tax bill in 2012 will be north of $2 billion.  Yes, that’s billion with a “B”. Zuckerberg, the founder of Facebook will be exercising roughly $5 billion worth of options, pegging him with a giant IRS bill of about $2 billion. Every time you log into Facebook now you can think about a young 27 year old laughing all the way to the bank. Nice smirk mark, I guess you knew this payday was coming.