https://www.cnbc.com/2018/04/10/how-to-see-if-my-facebook-data-was-shared.html

Facebook is now alerting users if their data was improperly shared with Cambridge Analytica. If your worried if your private data, including your public Facebook profile were shared, you can check easily. Here's how.

If your data was included in the breach, you'll see a notification like this: