Reports of a Facebook fake news detector are apparently a plugin

 Update: The feature appears to be an implementation of the Chrome plugin B.S. Detector, which some users took as a test by Facebook itself. We’ll continue to investigate but for now it looks like this is not a Facebook feature. Yes, the irony is rich.  Facebook is showing red warning labels above fake news links in the News Feed for some users in what appears to be a limited test. Read More

source https://techcrunch.com/2016/12/01/facebook-fake-news-flags-reliable-news-source/?ncid=rss