After Facebook founder Mark Zuckerberg warmly shook the hand of Indian Prime Minister Narendra Modi two weeks ago, protesting Indian-American activists sent the young billionaire hundreds of bottles of Purell. The unsolicited hand sanitizer was meant to remind Zuckerberg that he, along with the entourage of Silicon Valley CEOs whom he led in wooing and wowing Modi, was glad-handing a Hindu nationalist still tainted with the blood of hundreds of Muslims murdered in a 2002 pogrom in Gujarat when Modi was chief minister of the state. Within a day of Modi's return to India after his triumphant Silicon Valley visit, the brutal murder of a Muslim turned the Purell stunt into a prescient warning about the dangers of Zuckerberg-style selective diplomacy.