https://www.theguardian.com/news/2018/mar/22/facebook-gave-data-about-57bn-friendships-to-academic-aleksandr-kogan

Volume of data suggests trusted partnership with Aleksandr Kogan, says analyst

Before Facebook suspended Aleksandr Kogan from its platform for the data harvesting “scam” at the centre of the unfolding Cambridge Analytica scandal, the social media company enjoyed a close enough relationship with the researcher that it provided him with an anonymised, aggregate dataset of 57bn Facebook friendships.