ranks posts. >> the idea is to try and focus more on bringing people together by trying to put more emphasis on facilitating more meaningful social interactions between people. and the way we do that in ranking is to value things like commenting or writing a long comment more and valuing things like how long we might -- how long we think you watch a video for or less. >> facebook will elevate posts you interact with, demote news posts. facebook has 2 billion users. so, any change is a seismic event. but this update comes after a year of criticism, big criticism about the content on facebook including fake news and posts used to meddle in the elections. a lot of criticism that they've been done this too late, that they were for too long allowing their platform to be used for misinformation. thanks for joining us this friday morning. i'm christine romans. >> i'm dave briggs.