https://www.cnbc.com/2018/03/28/facebook-is-changing-what-data-advertisers-can-use-to-target-you-with-ads.html

Facebook is going to limit how much data it makes available to advertisers buying hyper-targeted ads on the social network.

More specifically, Facebook says it will stop using data from third-party data aggregators — companies like Experian and a — to help supplement its own data set for ad targeting.