Facebook emails

I just got an unsoliceted email from an Instagram account I'd never heard of, which was in Arabic. Following my email client's "Unsubscribe" link, I get taken to Facebook, where I'm greeted with the following message:

Quote:

From time to time, people may send emails to you through Facebook. Examples include when they invite you to an event, tag you in a photo or add you as a friend. If you continue, you'll no longer receive any of these emails. Also, Facebook will no longer use your email address to generate friend suggestions for you and others. We'll still keep a secure record of your email address so we can make sure you don't receive these emails. Do you want to stop receiving these notifications at [Email address]? [x] Stop receiving emails from friends through Facebook

The thing is, I don't have a Facebook account, and I never have. I also don't have an Instagram account, and I never have. I also use various script blockers and the like which should prevent anything Facebook related from running on any webpage even if it's embedded in it, and I don't follow links to Facebook.

All my googling turns up is pages talking about how to deactivate your Facebook account or how to stop receiving these emails from Facebook - all of which assume that you have an account. Absolutely nothing about receiving emails from Facebook if you don't have an account.

Anybody else ever encountered this, or similar?

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