A lot of people have sent me the story on Eduardo Saverin, who renounced his U.S. citizenship ahead of the Facebook IPO, ostensibly for purposes of reducing his tax burden, though the effect is not so clear. Saverin is a real cosmopolitan--born in Brazil, now apparently a resident of Singapore. Severing his ties to the U.S. is serious. Maybe he was worried about FATCA. In any event, I didn't know who Saverin was before and I don't really know all the ins and outs of why he's breaking up with the U.S., but I guess there's a good song for it anyway.