elizabeth dwoskin, welcome to the "newshour".i think my first question is, as thi shooter, this gunman, decided he was going to use his gmera as he bean this terrible massacre, was there anything in social media totop him? >> that's a great bit. it fee like the 10,000-foot question and it's a great question. uld say the social media companies, often they say, another day, another failure. this is oppornity first murder that's been streamed live on facebook or uploaded on to youtube, but it was the one most designed to go viral because the shooter was live streaming himself whi appearing to niche online communities that aggressively reposted it and reposrmd different tions of it, cutting it in half, cutting the length and even turning it into a video game. even after russian meddling and the tech companies sayingtt they're g millions of dollars of resources into fighting these problems, many couldn't take down the viral content for 24 hours. >> woodruff: i know you spent time talking to yowbtd, how did wey first see what was going