https://www.cnet.com/news/facebook-sets-new-rules-to-regulate-targeted-advertising/

Facebook is setting up new parameters meant to better inform you about targeted advertising.

Starting July 2, Facebook will require advertisers to tell its users if an ad they're seeing is served up because of info supplied by a data broker, a firm that collects and sells consumers' personal data to businesses. Advertisers will also need to show proof of legally acquired consent from consumers before uploading to Facebook's ad system lists of potential customers supplied by data brokers.