https://www.reuters.com/article/us-facebook-cambridge-analytica/academic-behind-facebook-breach-says-political-influence-was-exaggerated-idUSKBN1GX0OG

The consultancy at the heart of a storm over Facebook data greatly exaggerated its role in Donald Trump's 2016 U.S. presidential victory and would not have been able to sway an election result, the academic who provided the data said.