The social network’s actions come after a ProPublica investigation revealed that Facebook failed to keep its promise to reject discriminatory housing ads.

“Facebook said it would temporarily stop advertisers from being able to exclude viewers by race while it studies the use of its ad targeting system. “Until we can better ensure that our tools will not be used inappropriately, we are disabling the option that permits advertisers to exclude multicultural affinity segments from the audience for their ads,” Facebook Sheryl Sandberg wrote in a letter to the Congressional Black Caucus. ProPublica disclosed last week that Facebook was still allowing advertisers to buy housing ads that excluded audiences by race, despite its promises earlier this year to reject such ads. ProPublica also found that Facebook was not asking housing advertisers that blocked other sensitive audience categories — by religion, gender, or disability — to “self-certify” that their ads were compliant with anti-discrimination laws. Under the Fair Housing Act of 1968, it’s illegal to “to make, print, or publish, or cause to be made, printed, or published any notice, statement, or advertisement, with respect to the sale or rental of a dwelling that indicates any preference, limitation, or discrimination based on race, color, religion, sex, handicap, familial status, or national origin.” Violators face tens of thousands of dollars in fines…”