 When Donald Trump was shot, it was one of the very few times that photographs circulated on social media and could be trusted. The photo captured the bullet in mid-flight. In that split second, it tore through Mr. Trump's ear. It was taken by New York Times photographer Doug Mills. And the stunning photograph of Trump, blood on his face, fist in the air, surrounded by Secret Service, the American flag against a bright blue sky, will now take its place with the world's most historic photos. Both had one important thing in common.