facebook s rules and recommendations sent them one set up to follow conservative news got conspiracy recommendations after only two days. we asked facebook head of content policy whether these problems whether these problems can be fixed there will always be challenges in the social media landscape, just like you will never stop abuse in the offline world and you ll never stop abuse in the online world, you can get better at detecting it and preventing it. reporter: until whistleblower frances haugen turned these documents over to the sec and congress, much of this research was unknown. reporter: why should the public not get to see everything that you know about us our research is not secret in fact, we have a research program with more than a thousand people, and we publish hundreds of research articles every year. reporter: in this case, it took someone actually turning over documents for us to see a huge amount of what you know that we didn t know about