draw the line, where to draw the line, and how to make sure free expression reigns on the site. joining me now is the co-director of harvard's platform accountability project, who after his time in the obama white house, worked for facebook as a private and public policy adviser. ghosh quit in 2016 and wrote this paper calling on companies like facebook to acknowledge their role in misinformation. he wrote a column on this about on cnn.com that we will talk about. and here mo illithy. he moderated the q&a portion. thanks for being here. >> thanks for having me. >> i would love to know what you took away from zuckerberg's speech, given that it took place right there on your campus? >> it was interesting, we had a packed house. students lined up for hours, because they wanted to hear this. i appreciated it and i think a lot of appreciated his efforts to point out the complexities in a lot of these issues. he came in and said, maybe