We analyzed those files to get a better sense of how the Russian interference effort operated — and how well it worked. Overall, the files provide information on thousands of ads, including data on when ad campaigns began, when they ended, how effective they were and how much they cost. The two months in which the most campaigns began were May 2016 and April 2017 — shortly before the Russian effort was curtailed. In total, the ad campaigns racked up more than 37 million impressions — how often the ad was displayed to a user. The ads run afterward, though, were more successful.

Source: Washington Post May 10, 2018 18:45 UTC