voice, but we also need to do our part to stop the spread of hate and violence and misinformation. >> the volume of fake stuff is just unbelievable. facebook also will not place ads from fake news publishers on third party apps or web sites. facebook is a free and open platform or does it have to become more like -- i don't know. a gatekeeper of what is real information and what is not. >> there has been controversy on that. we will talk about that in the next hour as "early start" continues now. >> this is cnn breaking news. good morning. welcome to "early start." i'm christine romans. >> i'm boris sanchez. it is monday, november 21st. four police officers shot in the line of duty across the nation in just the span of 24 hours. here's what we know. two incidents took place in