In the charging document, HUD accuses Facebook of unlawfully discriminating against people based on race, religion, familial status, disability and other characteristics that closely align with the 1968 Fair House Act’s protected classes.

HUD also alleges Facebook allowed advertisers certain tools on their advertising platform that could exclude people who were classified as “non-American-born,” “non-Christian” or “interested in Hispanic culture,” among other things. It also said advertisers could exclude people based on ZIP code, essentially “drawing a red line around those neighborhoods on a map.”

Source: Housing Department Slaps Facebook With Discrimination Charge : NPR