Yes there is.
If your email address is in the contact list harvested by facebook when people register on the website, it is linked to your shadow profile and can be used to show the lack of explicit consent and existence of your shadow profile.
It's the path currently explored in a class action against facebook for forced consent and we'll see what happens.
This isn't true, you don't need to have offices in Europe for the GDPR to apply to your company. It's just if you're serving/having European customers. Which, if you compare it to shipping things across borders, makes sense (you can't just say "but it's legal in the US, where I'm sending the package from").
It's the path currently explored in a class action against facebook for forced consent and we'll see what happens.