Facebook chief faces tax bill of $1.5bn

Third submission (at least) of the ft.com article,

http://news.ycombinator.com/item?id=3551756

following an earlier submission of Wall Street Journal reporting on same issue.

http://news.ycombinator.com/item?id=3550074

For either story, the underlying primary source is the registration statement for Facebook's initial public offering of stock.