scrutiny for good reasons. you've reported on these hateful ads that you can use facebook or google or twitter or other companies to target hateful ads to people? >> i would mention when we're looking at the question of media literacy, the company doesn't give users information by which they can reasonably adjudicate what's legitimate and what's not, what's coming from other americans and what's not. it's up to you even though you don't the tools as a facebook user to make this determination and it becomes either on the one hand a default assumption that you are seeing credible investigation from other americans or alternatively it's up to you to say this whole thing is fake, i don't trust whatever i'm giving you. >> and fake news came from a lot of sources before election day. it wasn't just russian propagandists in moscow putting up bs stories on the internet. but the point is mueller honing in on to what extent russia was responsible for some of the lies and propaganda that was out