https://motherboard.vice.com/en_us/article/wjm399/department-of-housing-charges-facebook-for-discriminatory-housing-ads

The US Department of Housing and Urban Development (HUD) charged Facebook with violating the Fair Housing Act on Thursday for enabling discrimination in housing ads based on “race, color, religion, sex, familial status, national origin and disability."

It is illegal under the Fair Housing Act (FHA) to publish housing ads that indicate any “preference limitation, or discrimination” based on protected characteristics. HUD alleges Facebook allowed advertisers to exclude housing ads from “‘women in the workforce,’ ‘moms of grade school kids,’ ‘foreigners,’ ‘Puerto Rico Islanders,” and other protected groups.