https://www.theregister.co.uk/2018/05/29/facebook_adverts_age_discrimination_lawsuit/

A lawsuit alleging that Amazon.com, Cox Media Group, Cox Communications and T-Mobile US used Facebook ads to discriminate against older jobseekers has been expanded to finger other organizations, including Facebook.

The complaint was filed in December on behalf of the Communications Workers of America union, in the wake of a ProPublica investigation that found Facebook ads were being used for age discrimination. An similar inquiry a year earlier found Facebook ads being used for racial discrimination in housing.