The UK CMA says Meta pledged to let Facebook Marketplace users opt out of Meta using their data and limit how the company uses ad data for product development
Joseph Hoppe / Wall Street Journal :
Context & Ripple Effects
This is the next step in the CMA's Marketplace data case: Meta had already proposed limits on using other businesses' advertising data for Marketplace, and the new commitments add user choice and product-development restrictions.
The move also sits alongside Meta's separate response to European privacy pressure, where it was reported to offer an opt-out from some personalized advertising. It matters because the CMA is addressing how data gathered across a platform can advantage its own adjacent service.
First-order effects
- Facebook Marketplace users gain an opt-out from Meta's use of their data under the CMA-backed pledge.
- Meta must constrain the use of advertising data in Marketplace product development, reducing the data available for improving that service under the proposed rules.
Second-order effects
- Marketplace advertisers and rival marketplace operators gain clearer limits on Meta's ability to turn advertisers' data into product advantages, reinforcing the CMA's scrutiny of platform self-preferencing.
- The commitments create an operational incentive for Meta to separate consent, advertising-data handling, and Marketplace product workflows rather than treating them as one data pool.
Third-order effects
- If enforced and replicated, such commitments can make consent and internal data-access controls a central competition remedy for multi-sided platforms—not only a privacy compliance tool.
- The later CMA acceptance of Meta's Marketplace ad-data changes suggests this case could become a durable model for policing the use of business-customer data by platform operators.
The trend: Competition regulators are increasingly targeting the data flows that let large platforms use activity from one side of a market to improve their own adjacent products.