points of view are reasonable and worth exploring. >> on youtube there are videos that violated our incitement policies. >> the system isn't perfect, but it's the best approach that we found to address misinformation in line with our country's values. >> quite a number of social media companies have de-platformed people who have been spewing misinformation and conspiracy theories. is that enough? >> my concern over the de-platforming we've seen to date is it doesn't appear to be particularly consistent. i think there need to be more transparent policies about what people can do and say on these platforms. and these companies have to exercise judgment around applying their policy so that society doesn't unwind. >> until we get to a time and place where social media companies take full responsibility for misinformation on their