Earlier quoted context omitted.
There is no indication of preference/limitation/discrimination in the content that reaches the end user of Facebook.
The lengths at which you are going to rationalize racism just astounds me. Answer me this. How on Facebook you would expect an excluded person to be able to know about the sale? They wouldn't. The housing listing doesn't exist for them. How do you see this as fair?! I am blown away by all the casual racism all throughout this thread.
I still don't believe that merely providing the option to create potentially discriminatory ads is a problem for Facebook, since the same options have perfectly valid usage. It should be the landlord's responsibility to use them correctly.