Everyone knows that it’s illegal for a hotel such as a Marriott or a Hilton to refuse you a room because of your race. But what about someone who temporarily rents out their own apartment on Airbnb?

On Friday, NPR hosted a Twitter chat with the hashtag #AirbnbWhileBlack. Airbnb’s service — which includes the photos and names of travelers looking for accommodation — has been in the spotlight because of alleged discrimination by hosts against non-white guests.