https://www.reuters.com/article/us-facebook-cambridge-analytica-kogan/academic-at-center-of-facebook-row-says-the-data-is-greatly-exaggerated-bbc-idUSKBN1GX0T5

The Cambridge University academic at the center of a row over the use of Facebook data said the accuracy of the information he produced had been greatly exaggerated and would not be able to sway an election.