Facebook SWE interview: product design round

I’m a little lost on what to expect for this product design interview round at Facebook. I think it’s a question like, design type ahead suggestion, or real estate search. Is there any other examples or go into any detail on any, or if there are any resources anywhere I can go to read prep materials for this specifically? That would be really helpful to gauge what they might be looking for, since most of the resources online are around system design and scaling.