Facebook, Google and Twitter first disclosed last year that they had identified Russian meddling on their sites. Critics previously said it took too long to come to an understanding of the disinformation campaign, and that Russian strategies have likely shifted since then. The companies have awakened to the threat - Facebook in particular created a "war room" this fall to combat interference around elections - but none have revealed interference around the midterm elections last month on the scale of what happened in 2016.