Meta and Google teamed up to run a secret campaign that deliberately targeted 13 to 17-year-olds with Instagram ads on YouTube according to the Financial Times, breaking the search giant’s own rules against advertising to children.

The publication reports that Google directed ads to a subset of users labeled as “unknown” in its advertising systems, in an attempt to disguise the group skewed toward teenagers. According to a Google Ads help page, the “unknown” demographic category…