Growing up in Atlanta in the 1970s, Jonathan Weisman didn't think much about anti-Semitism. In fact, he didn't think much about being Jewish until 2016. That's when, as deputy editor of the Washington Bureau of The New York Times , he posted a quote from an op-ed about facism on Twitter. That tweet unleashed a torrent of anti-Semitic images, threats and other forms of cyber-stalking that shattered his complacency.