Facebook Will Limit Data Available to Advertisers
Facebook announced yesterday that it will be shuttering Partner Categories: the product that allows third-party data providers to supplement advertisers with targeting information directly through Facebook.
In the announcement, Facebook noted that "this is common industry practice," but will still shutter the product to "help improve people’s privacy on Facebook."
This article goes into great detail describing the policy change and how it affects marketers. I don't think we'll notice a difference when creating ads unless you have really really (scary) targeted ads.