According to a Financial Times (FT) report, the imminent Facebook IPO will make the social network's founder, chairman, and CEO Mark Zuckerberg one of the richest people in the world; with his Facebook stake likely to be worth as much as a whopping $28.4 billion, and his 2011 personal income tax bill reaching up to a staggering $1.5 billion.

And, Zuckerberg may actually end up with an even higher tax bill if Facebook's $5 billion IPO - filed with the SEC earlier this week - turns out to be more successful that what the analysts have been projecting!

As per the FT report, the Facebook stock is presently selling for approximately $40 per share in private secondary markets; thus giving Zuckerberg, 27, the possibility of netting nearly $4.8 billion at the IPO if he buys all 120 million shares at the mentioned price.

However, with two `inside' sources revealing that Facebook is discussing a valuation in the range of between $75 billion and $100 billion, the FT report has further noted that, in that case, Zuckerberg could net $6billion.

About Zuckerberg's possible tax bill for 2011, Victor Fleischer - associate professor of law at the University of Colorado - explained that Zuckerberg's tax rate will be 35 percent; thereby implying that his tax bill would be nearly $1.67 billion.

Moreover, Facebook's Form S-1 SEC filing has also revealed that the total compensation package which Zuckerberg will draw for 2011 will be an astounding $1,487,362 --- including $483,333 in salary; $220,500 in bonus; and $783,529 in "other compensation"!