Facebook informed Congress last week that it had identified 3,000 ads that ran between June 2015 and May 2017 that were linked to fake accounts. Those accounts, in turn, were linked to the pro-Kremlin troll farm known as the Internet Research Agency.
The info Facebook shared w/ Mueller incl. copies of the ads, details about the accounts that bought them & the targeting criteria they used.
Trump's scam is unraveling day by day.