https://www.recode.net/2018/3/28/17174098/facebook-data-advertising-targeting-change-experian-acxiom

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 Acxiom — to help supplement its own data set for ad targeting.