The financial journalist Martin Lewis is currently suing Facebook, because fraudsters are using his name and image to promote their schemes through Facebook advertising. The targeted nature of Facebook advertising makes it impossible to audit - there's no way of viewing all the ads being served on the platform. Lewis has been relying on members of the public to send him screenshots when these adverts appear in their feeds.

https://www.bbc.co.uk/news/entertainment-arts-43857921