investigation in response. and in 2017, 3,000 news outlets around the world share tweets that originated from russian bots, even marquee publications from "the washington post" and our own nbc news. making it not just a campaign tactic, it is happening right now in the present tense. my guest tonight on -- for the special discussion the author of the all new don't think of an elephant and an expert on how donald trump and others use and sometimes abuse twitter." nick, part of this story, fraud works best when it's not caught. how did that play under your analysis? >> this story we did is a key