These retailers share customer data with Facebook's owner. Customers may not have been told

When a shopper shares their email address at the cash register — to receive an electronic receipt, rather than a paper one — do they really know where their details are being sent? A CBC News review of Facebook user data suggests a variety of well-known retailers in Canada have been sharing customer information with the social media platform's parent company to gain marketing research in return. And it's not clear what steps have been taken to warn shoppers.
Read more: https://www.cbc.ca/news/business/retailers-sharing-data-meta-1.6737484?source=Snapzu