Only small fry. Knuddels, a German chat platform, was fined for a data breach and storing passwords unencrypted.
But data protection institutions are warming up for taking Facebook to task: https://www.cnbc.com/2018/10/04/facebook-data-breach-top-eu-... - the 1.6bn is way over the top since FB informed customers in time, but still this will be a lighthouse case.