Over at PandoDaily, Farhad Manjoo has an excellent post on Facebook co-founder Eduardo Saverin’s shameful decision to renounce his US citizenship to avoid taxes. I won’t pretend to understand the legal aspects of all of this. However, it’s easy to see when something is simply wrong. If nothing else, Saverin should be barred from ever setting foot in the United States again. That, or charge him a few hundred million for a visa.