You've probably already read this story—Facebook Co-Founder Renounces U.S. Citizenship in Advance of IPO, Saving Millions in U.S. Taxes —heard about it on the radio, or seen it on TV.   But Paul L. Caron of The TaxProf Blog has done a remarkable job of aggregating all the media responses to the story from about 20+ outlets, and linking to previous posts this week on the developing story.     On Thursday:  B ...