Facebook's latest move on Russian fake news is too little, too late

Facebook published a blog post Wednesday outlining its plans to fully explain how Russian agents used its social network to influence the 2016 presidential elections. The cornerstone of its transparency going forwards will be a tool, accessible by the end of the year, that should let users know if they liked or followed a Facebook Page created by a Russian troll farm. The tool will not, however, inform any of the estimated 140 million users who might've seen that content without liking or follow...