https://techcrunch.com/2017/11/01/russian-facebook-ad-spend/

Russian information troll farm the Internert Research Agency spent just 0.05% as much on Facebook ads as Hillary Clinton and Donald Trump’s campaigns combined in the run up to the 2016 US presidential election. Clinton and Trump spent $81 million, while the IRA spent $46,000. Facebook general counsel Colin Stretch revealed these figures today during the Senate Intelligence Committee’s hearing with Facebook, Twitter, and Google about Russian election interference.

The fact that the top campaigns spent 1760X more on election ads than one group of Russian meddlers puts the whole situation into context. The IRA ad buy was tiny by comparison. This aligns with Stretch’s main talking point that Russian propaganda content was a tiny fraction of the content and ads seen on Facebook.