How does Meta work with data providers?
Businesses may continue, on their own, to work with data providers. Many businesses today work with third parties to help manage and understand their marketing efforts. For example, an auto dealer may want to customize an offer to people who are likely to be interested in buying a new car. The dealer also might want to send offers, like discounts for service, to customers that have purchased a car from them. To do this, the auto dealer works with a third-party company to identify and reach those customers with the right offer.
So businesses who advertise to you may be using a list of people that they've gotten, or gotten the ability to use, from third parties that they work with for their marketing efforts. Businesses that advertise on Facebook are required to have any necessary rights and permissions to use this information, as outlined in our Custom Audience Terms that businesses must agree to.
You can learn more about what influences the ads you see and control your ads experience by visiting Ad Preferences.