Facebook is giving up on third party data sources which it used to help advertisers target users accurately.
Facebook Product Marketing Director Graham Mudd elaborated on the decision in a statement:
We want to let advertisers know that we will be shutting down Partner Categories. This product enables third party data providers to offer their targeting directly on Facebook. While this is common industry practice, we believe this step, winding down over the next six months, will help improve people’s privacy on Facebook.