https://www.theguardian.com/technology/live/2017/oct/31/facebook-google-twitter-congress-russian-election-meddling-live

Tech giants go before Senate judiciary committee to explain how and why Russian operatives were given free rein to tamper with 2016 US election

In this blog we’ll consider how Russian tampering on social platforms in the 2016 election was carried out by online imposters and totally missed by the platform hosts. We’ll see how bad the hosts now feel about it all, if they do.