https://phys.org/news/2019-02-facebook-appeal-german-data-use.html

"On the one hand there is a service provided to users free of charge," Cartel Office president Andreas Mundt said. "On the other hand, the attractiveness and value of the advertising spaces increase with the amount and detail of user data. It is therefore precisely in the area of data collection and data use where Facebook, as a dominant company, must comply with the rules and laws applicable in Germany and Europe."

Facebook said it rejected the decision, and would appeal within the one-month frame before it becomes final.